Figure 1 Illustrations of major types of pavement‑induced tyre distress

The focus of tyre regulations has shifted towards sustainability. Our research on passenger car radial tyres (PCR) strength evaluation and the strength testing requirements in the IS15633 standard aligns precisely with this trend. Before discussing why, the traditional plunger-strength test has become irrelevant for evaluating PCR tyres, let us first consider the benefits of eliminating it. Based on Continental’s engineering experience, waiving the strength test allows for an average reduction of 0.7 kg (range: 0.5–0.9 kg) in cap ply material. This translates to saving approximately USD 0.70 in material costs per tyre while simultaneously lowering rolling resistance, which yields a carbon reduction benefit of about 6 kg per tyre in-use-phase. Given that the Indian PCR market involves approximately 32 million replacement and 20 million original equipment PCR tyres, the potential annual impact includes saving roughly 40,000 tonnes of material, cutting costs by about USD 43 million and reducing carbon emissions by approximately 370,000 tonnes; over a 10- to 20-year horizon, these would yield substantial societal sustainability benefit. This paper examines the history of the strength test and addresses the issue of its unsuitability for evaluating PCR tyres and provides supporting arguments to help realise these prospective benefits.

It is well‑documented that tyre‑strength testing originated to address road‑hazard impact damage. Tyre strength evaluation protocols were developed specifically to address damage caused by such impacts. Literature indicates that, starting in the 1960s, tyre‑and‑wheel damage caused by striking potholes, road shoulders or curbs became a major safety concern for automotive OEMs. The Society of Automotive Engineers (SAE) categorised this form of damaging impact as ‘road hazard impacts’. Over the following six decades, multiple test methodologies – including tyre strength tests (Plunger test), pendulum‑impact tests and full‑vehicle obstacle‑impact tests – were developed for new PCR to assess road‑hazard‑impact effects on treads, sidewalls and wheel assemblies. This work clarifies the fundamental nature of tyre‑strength‑related problems and traces the origin and evolution of these test methods. It aims to furnish a technical basis for industry and regulatory authorities to revise strength‑test standards and to support tyre manufacturers and vehicle OEMs in appropriately applying these evaluation methods when resolving consumer complaints about tyre performance.

I. WHAT IS A ROAD‑HAZARD IMPACT?

Damage to tyres and wheels resulting from driving over potholes or obstacles such as curbs and speed bumps is defined as a damaging road‑hazard impact (Figure 1). Such events remain common on real‑world roads today.

II. WHAT IS TYRE-STRENGTH EVALUATION?

Tyre‑strength evaluation assesses the external‑force thresholds at which a tyre undergoes structural failure, as well as the corresponding failure force and energy levels. Structural failure denotes rupture of reinforcing cords within the carcass, cap ply or belt layers, leading to air leakage, bulging or related defects. It is critical to distinguish air leakage caused by sharp‑object punctures – a puncture‑resistance and air‑retention concern – from true structural‑strength failure. Sharp‑object punctures can often be repaired, or leakage mitigated through sealant application. By contrast, structural damage arising from severe road‑hazard impacts is non‑repairable. Major tyre‑industry associations uniformly advise consumers against continuing service use of tyres that have sustained such structural failure.

We emphasise that air leakage from sharp‑object punctures does not constitute a tyre‑strength issue. A comparison between damage generated in a plunger‑type strength test (Figure 2(a)) and nail puncture damage (Figure 2(b)) highlights this distinction: plunger‑induced failure ruptures belt layers and creates large tears in the inner liner, whereas nail‑style sharp‑object punctures do not rupture reinforcing layers and produce only a small inner‑liner wound.

Figure 2(a) Tyre damage caused by plunger strength test

Figure 2(b) Tyre damage caused by nail puncture88  

III. DISTINCT DAMAGE PATTERNS FROM ROAD‑HAZARD IMPACTS: RADIAL VERSUS BIAS‑PLY TYRES

Research demonstrates that road‑hazard‑impact damage manifests differently for bias‑ply and radial tyres. For bias‑ply tyres, impacts predominantly generate crown‑region damage; for radial tyres, impacts most commonly produce sidewall bulging and wheel‑assembly damage.

These divergent failure modes stem from fundamental structural and material differences between the two tyre architectures. As shown in Figure 3(a), bias‑ply tyres use rayon, nylon or polyester reinforcing plies arranged in criss‑cross orientations at angles below 90° relative to the tread centreline, running continuously from one bead to the opposite bead. This forms a monolithic structure with high overall integrity and stiff sidewalls. The tyre resists bending, and its constituent structural elements do not deform independently under external loading. By comparison (Figure 3(b)), radial‑tyre carcass plies run at approximately 90° relative to the tread centreline, extending bead‑to‑bead. The tread circumference is further reinforced by two steel belt layers plus a rayon, nylon or polyester cap ply. This creates a dual‑component architecture: a rigid, robust crown coupled with a flexible, air‑spring‑like tyre body. The carcass exhibits high elasticity, sidewalls deform readily under load and the tyre absorbs road impacts with unique dynamic behaviour under external forces.

(Figure 3 (a) Schematic of bias-ply tyre design)
(Figure 3 (b) Schematic of radial tyre design)

THE STRUCTURAL CHARACTERISTICS OF BIAS-PLY AND RADIAL TYRES REVEAL THE FOLLOWING:

(1) The materials used for the circumferential cap ply and belt layers in radial tyres possess greater strength than the rayon, nylon or polyester belt materials found in bias-ply tyres;

(2) Because radial tyre sidewalls are highly flexible and prone to deformation, impact forces often cause damage to the vehicle suspension, rim or sidewall (such as bulging) before the tyre crown accumulates enough energy to suffer structural failure. Traditional strength testing involves a 19 mm plunger vertically compressing the tyre crown to simulate the forces experienced when a tyre strikes a small road obstacle (like a stone). CT images captured during a strength test of a 185/60R15 88T tyre clearly show that the plunger must descend almost to the point of touching the rim before it can puncture the crown plies and belt layers to reach the failure energy limit. This process causes incredible sidewall deformation due to the tyre’s high flexibility; however, in real-world driving conditions, the rim or suspension system would sustain damage long before the tyre could undergo such extreme deformation from a road impact.

Figure 4 CT scan imagery captured during tyre‑strength testing

A detailed structural comparison between bias‑ply and radial tyres appears in the February 2020 paper Observations on Tyre Plunger Strength and Bead Unseating Performance by Professor Joseph D Walter (University of Akron). Walter notes that bias‑ply plies form a rhombic (parallelogram‑like) structural arrangement, while the combination of belt layers and carcass plies in radial tyres yields a triangulated structural configuration. Figure 5 contrasts the load‑driven deformation characteristics of these two architectures.

Within bias-ply tyres, measurable changes in cord angle occur repeatedly during the loading and unloading cycles of each tyre rotation; consequently, the rhombic structure of the bias plies is also referred to as a ‘shear’ structure. These angular changes induce significant shear strain within the rubber, leading to the accumulation of hysteretic heat – an effect that is markedly reduced in radial tyres due to their triangular structural configuration. In modern radial tyres, the carcass ply material (whether polyester or rayon) situated beneath the steel belt layers forms a stable triangular structure that reinforces the tread area. These deformation-resistant triangles provide vastly superior strength and rigidity compared to other structural designs. Without the underlying carcass plies, the belt cords – whether steel or textile – would simply form a non-rigid rhombic structure, resulting in performance characteristics identical to those of bias-ply tyres.

Figure 5 Deformation differences between rhombic‑shear and triangulated structures

Figure 6 Strength‑evaluation criteria defined within SAE J918

In summary: the monolithic structure of bias‑ply tyres and dual‑component architecture of radial tyres produce fundamentally different failure modes under road‑hazard impact. Radial tyres deliver well‑established advantages in vehicle handling, ride comfort, service life, rolling resistance and lightweight performance. The industry’s shift from bias‑ply to radial construction necessitates updated assessment approaches for impact‑related damage, particularly for low‑aspect‑ratio radial tyres. Legacy strength‑evaluation criteria originally designed for bias‑ply tyres cannot simply be carried over unchanged.

IV. EVALUATION APPROACHES FOR ROAD‑HAZARD‑IMPACT DAMAGE

1. Road‑hazard‑impact evaluation for bias‑ply tyres:

Tyre‑strength testing and crown‑ply‑rupture assessment were pioneered in the United States. In 1965, SAE published SAE J918, Passenger Car Tyre Performance Requirements and Test Procedures, establishing tyre‑strength test procedures and defining minimum failure‑energy acceptance criteria for rayon‑, nylon‑and‑polyester‑constructed bias‑ply tyres.

Full original theoretical rationale for these early performance metrics is no longer traceable. Nevertheless, historical literature yields notable observations:

1) The standards specified higher strength limits for nylon or polyester than for rayon. In effect, strength‑performance limits were calibrated to match the tyre‑construction raw materials in use at that time.

2) The standards established minimum strength requirements not only for bias-ply tyres – which were the norm at the time – but also for radial tyres. Production radial passenger‑car tyres were not fitted as original equipment on US vehicles until 1970. Given the absence of vehicles equipped with radial tyres on the road back then, the limits clearly were not derived from real-world issues specific to radials; instead, the standards simply adopted the bias-ply strength limits – a practice that has persisted for 60 years despite the lack of an empirical basis regarding radial tyres.

2. Road‑hazard‑impact damage for radial‑ply tyres:

By the 1990s, radial‑tyre market penetration in the United States approached 90 percent. SAE practitioners then recognised that road‑hazard‑impact failure modes for radial tyres diverged sharply from those seen with legacy bias‑ply tyres. Real-world radial-tyre impact events typically produce sidewall or rim damage. The plunger‑style strength test, which was designed to assess tread‑crown robustness, provides little meaningful insight into these real‑world radial‑tyre failure modes. Accordingly, SAE released the SAE J1981 in 1994: Road Hazard Impact Test for Wheel/Tyre Assemblies, introducing pendulum-impact test to simulate damage to complete tyre‑wheel assemblies. In a February 2020 letter to the NHTSA (National Highway Traffic Safety Administration), the USTMA (U.S. Tyre Manufacturers Association) stated: “By 2000, the industry recognised that radial tyres were not susceptible to the specific damage modes targeted by [traditional] strength tests; automakers also observed that radial tyre sidewalls were relatively ‘soft’, meaning that impacts with potholes or obstacles often resulted in suspension or rim damage, or sidewall bulging, rather than tread-area failure.”

Our research highlights that both pendulum‑impact tests and plunger‑strength tests originated as successive SAE methodologies addressing road‑hazard hazards, reflecting the distinct failure physics of bias‑ply versus radial tyres. Additional supporting documentation comes from Tyre Laboratory Strength Test Validation Report (NHTSA‑2000‑8011‑0020). In March 2002, NHTSA floated a proposal to replace traditional plunger test with pendulum‑impact testing per SAE J1981, envisioning pendulum impact as a dynamic alternative for tyre‑strength assessment. Figure 7 displays representative impact strikers used within that NHTSA research programme, including wedge‑form impactors and a 50 mm cylindrical striker conceptually analogous to plunger tips used in commercial‑vehicle tyre‑strength testing.

Figure 7 S Impact strikers evaluated for NHTSA pendulum‑surrogate‑strength‑test research

Test outcomes from this project disappointed NHTSA; the proposal failed to gain acceptance across tyre and automotive stakeholders. In 2002, the Rubber Manufacturers Association (RMA), Ford Motor Company and the European Tyre and Rubber Manufacturers’ Association (ETRMA) explicitly commented that pendulum‑impact testing primarily evaluates complete wheel‑assembly damage from road hazards. Its standalone suitability for assessing tyre‑intrinsic strength required further refinement and validation. As a result, NHTSA formally withdrew its proposal to substitute pendulum impact for plunger‑strength testing in June 2003, while research activities targeting radial‑tyre‑suited strength‑assessment methods continued.

During 2011‑2013, Germany’s VDA (German Association of the Automotive Industry) and WDK (German Rubber Industry Association) built upon SAE J1981 to investigate correlations between laboratory pendulum‑impact results and full‑vehicle impact behaviour. Their studies demonstrated poor correlation between pendulum‑impact measured energies and energies observed in full‑vehicle obstacle‑impact events, corroborating why NHTSA’s 2002 proposal could not succeed. WDK member companies nonetheless derived a dimensionless ‘f‑value’ via empirical formulas incorporating tyre‑geometric and load parameters; this f‑value exhibited partial correlation with full‑vehicle impact speeds. These research outputs were subsequently published within the VDA 11‑2016 technical guideline.

It should be noted that the validity of the f-factor evaluation relies on its correlation with vehicle impact speeds; if this correlation is disproven, the f-factor loses its viability. Furthermore, the f-value in the VDA-11 method is intended as a design reference for sidewall strength during the development of specific vehicle models, rather than as a general strength evaluation metric for tyres independent of specific vehicle models. We found that neither the SAE method nor the VDA f-value could serve as a general strength evaluation method for radial tyres without relying on parameters specific to a vehicle model (such as wheel assembly strength, suspension stiffness and vehicle load). To verify this finding and gather evidence, Continental Tyre conducted validation tests in China in collaboration with the National Tyre Quality Supervision and Inspection Center. By comparing vehicle-based impact tests and pendulum impact tests across two vehicle platforms and using various obstacle heights, the following observations were made:

Figure 8 Comparative test results: Golf 7 versus Regal

(red data points = Golf 7; blue data points = Regal)

1. For one fixed vehicle platform, laboratory pendulum‑derived f‑values show partial correlation with real‑vehicle damage‑onset impact speeds, yet this correlation remains unstable. Substantial f‑value scatter can occur at constant impact velocity, and conversely, similar f‑values may correspond to very different impact speeds.

2. Tyres yielding identical f‑values in pendulum testing exhibit divergent damage‑threshold impact speeds when fitted on different production vehicles. In our test campaign, the ratio of damage‑threshold speeds for the Golf 7 and Regal vehicles approximated the ratio of their respective curb weights.

3. Damage‑threshold impact speeds show an approximately exponential dependence on obstacle height. Changing obstacle height therefore exerts an exponential influence on measured test outcomes. (Figure 9)

Many consumer complaints about sidewall bulging relate to damage incurred at relatively low driving speeds, for instance after striking potholes or kerbs. Defining

Figure 9 Regal impact‑test results: 80 mm vs 100 mm obstacle heights (red points = 100 mm obstacle height; blue points = 80 mm obstacle height)

tyre‑performance limits expressed via vehicle‑specific impact speeds or f‑factors – further adjusted for tyre aspect ratio – cannot adequately resolve real‑world consumer‑complaint scenarios. Such an approach also departs from the original technical intent of SAE‑and VDA‑defined pendulum‑based f‑values, which were conceived to correlate against full‑vehicle impact‑speed observations. Consequently, applying f‑factors or vehicle‑specific impact‑test outcomes as universal tyre‑strength‑evaluation criteria remains unfeasible at present.

Legacy plunger‑strength‑test procedures were conceived for bias‑ply tyres. A radial tyre’s plunger‑strength‑test performance tells us nothing about its real‑world propensity for sidewall bulging, rim damage or suspension damage following impact events. Plunger‑strength‑test results cannot characterise radial‑tyre road‑hazard‑impact robustness. Retaining the existing plunger‑strength‑test requirement for radial tyres solely for lack of a replacement methodology serves no practical purpose.

1. Provide sufficient consumer training explaining that radial tyres – particularly low‑aspect‑ratio variants – are inherently vulnerable to road‑hazard‑impact damage (e.g. pothole, curb strikes) as a direct consequence of their structural design.

2. Impact‑resistance degrades as tyre section height decreases. For vehicles intended for harsh‑road operating conditions (e.g. off‑road platforms), vehicle‑designers and end‑users should select appropriately‑specified tyres. Avoid fitting low‑aspect‑ratio wide tread tyres optimised for high‑performance road‑car track use onto off‑road‑oriented vehicles purely for aesthetic reasons.

3. Expand market‑level training and public guidance on identifying sidewall‑bulge damage and associated tyre‑replacement requirements, preventing tyres with observable bulges from remaining in‑service and creating safety hazards.

Radial‑tyre architecture delivers high‑stiffness crown regions paired with flexible, low‑stiffness sidewalls. Ongoing market trends towards lower aspect ratios exacerbate sidewall‑bulge failure risks. Industry stakeholders should communicate realistic operational limitations of radial tyres to end‑users and educate consumers on mitigating road‑hazard‑impact risks, rather than persisting with obsolete, functionally‑irrelevant legacy strength‑test requirements or adopting new, theoretically‑contested strength‑factor metrics to resolve real‑world service‑complaint tensions. In particular, hastily‑mandated sidewall‑strength minimum limits risk impeding market progress towards high‑performance, low‑aspect‑ratio radial‑tyre deployment.

We hope these preliminary research findings support industry and regulatory stakeholders addressing real‑world consumer‑and‑technical challenges. This work informs further deliberation over the continued applicability of legacy tyre‑strength testing, as well as the potential adoption constraints of pendulum‑impact‑based assessment and f‑factor methodologies, while preserving the dynamic‑performance and structural‑design advantages intrinsic to radial tyres.

VI. OUTLOOK FOR FUTURE RADIAL‑TYRE‑STRENGTH‑EVALUATION WORK

1. Owing to radial tyres’ structural‑mechanical characteristics, real‑world road‑hazard‑impact events predominantly produce sidewall damage; secondary damage may occur on wheel‑hubs or vehicle‑suspension components. Crown‑region structural failure is rarely observed. Accordingly, the existing plunger‑strength‑test methodology cannot deliver actionable insights for modern radial‑tyre assessment.

2. The shift towards radial‑tyre construction is irreversible. Removing prescriptive sidewall‑strength mandates unlocks design freedom for tyre dynamic performance, enabling improvements in vehicle handling and low‑emission capability. This represents an advanced tier of automotive safety, realising lightweighting and energy‑saving potential that would otherwise be constrained by rigid strength‑test requirements.

3. When handling consumer complaints about bulging sidewalls on low‑aspect‑ratio UHP/UUHP high‑performance radial tyres, stakeholders must recognise the trade‑offs inherent to radial‑tyre dual‑component architecture: superior dynamic performance comes alongside inherent sidewall‑impact‑vulnerability. Vehicle OEMs need to fully understand the operational characteristics of low‑aspect‑ratio high‑performance tyres, and communicate clearly to end‑users. Consumers should be made aware to avoid abusive curb‑strike events while benefitting from high‑performance‑tyre capabilities. Test data demonstrates that raising obstacle height from 80 mm to 100 mm can reduce the tyre‑damage‑onset safe‑impact speed by as much as 43 percent.

Advancing passenger car radial tyre and high-performance tyre technology to achieve lightweight and sustainable performance is the industry’s forward-looking development priority. This study clarifies the historical context of tyre strength evaluation practice; it supplies technical background to support proposal on revision of relative Indian IS standard and delivers practical guidance for consumers operating high‑performance tyres as well as for vehicle‑OEM tyre‑specification engineers.

The author is the Head Of APAC Standards And Regulations, Continental Tires.

The tyre industry is entering one of the most transformative phases in its history. Manufacturing is no longer defined only by production capacity, compound formulation or tread design. The future will be shaped by how effectively manufacturers combine advanced engineering, intelligent manufacturing, sustainability, application-specific innovation, smart technologies and global competitiveness.

For us at Rubber King Tyre Pvt. Ltd., the direction is clear: the tyre of the future must perform reliably where conditions are most demanding. This philosophy is captured in our brand promise: ‘RULE THE TERRAIN – Tyres for the Untamed’.

It represents more than a tagline. It reflects how we see the future of tyre engineering – developing products capable of performing across challenging agricultural fields, construction sites, mining environments and demanding material-handling applications as per customer expectations.

Devin Gawarvala

FROM TYRE MANUFACTURING TO PERFORMANCE ENGINEERING

Customers today are increasingly evaluating tyres on total performance rather than purchase price alone. Tyre life, traction, load-carrying capability, resistance to cuts and wear, heat management, equipment uptime and overall cost per operating hour are becoming critical considerations.

This is particularly relevant in the OTR, agriculture and industrial segments, where operating conditions can vary dramatically.

The future, therefore, belongs to application-driven tyre engineering. Instead of developing products primarily around dimensions and specifications, manufacturers will increasingly engineer tyres around the machine, terrain, load cycle, operating hours and customer requirements.

At Rubber King, this approach aligns closely with our focus on pneumatic and solid tyre solutions across agriculture, construction, mining, OTR and industrial applications. The company currently operates four manufacturing facilities in Gujarat and has built its product philosophy around durability, performance and precision engineering.

SMART MANUFACTURING WILL REDEFINE CONSISTENCY

The next major transformation will take place inside tyre factories.

Automation, digital process monitoring, data analytics and increasingly intelligent manufacturing systems will enable manufacturers to achieve greater consistency while improving productivity and reducing process variations.

However, smart manufacturing should not simply mean installing more automated equipment. Its real value comes from connecting people, processes, machines, materials and data.

Data generated across mixing, component preparation, building, curing, inspection and testing can help manufacturers identify variations earlier, improve traceability and strengthen preventive quality systems.

For Indian manufacturers, this presents an important opportunity. Combining our manufacturing capabilities and engineering talent with greater automation and digitalisation can significantly strengthen India’s position as a global tyre manufacturing hub.

SUSTAINABILITY MUST WORK ALONGSIDE PERFORMANCE

Sustainability will also become fundamental to the future of tyre manufacturing.

The industry will need to examine the complete product lifecycle – from sourcing raw materials and improving manufacturing efficiency to extending tyre life and addressing end-of-life recovery. Recent industry research is already demonstrating the potential of bio-sourced materials, recycled inputs and recovered carbon black to reduce the environmental footprint of tyre production while maintaining required performance standards.

For manufacturers, the challenge is to ensure that sustainability does not come at the cost of durability or safety.

In demanding OTR and industrial applications, a tyre that lasts longer can itself contribute to resource efficiency. Extending service life, reducing premature replacement and improving operating efficiency should therefore form an important part of the sustainability conversation.

The future will require manufacturers to achieve both objectives: lower environmental impact and higher product performance.

R&D WILL BECOME THE COMPETITIVE DIFFERENTIATOR

As equipment becomes more powerful and applications become increasingly specialised, research and development will play an even greater role.

Compound technology, casing design, tread geometry, heat dissipation, rolling resistance, cut and chip resistance and load optimisation will continue to evolve. At the same time, faster testing and feedback from real-world applications will allow manufacturers to shorten development cycles.

Rubber King’s R&D approach includes product development, technology upgrades, process optimisation, material evaluation and testing procedures aligned with internationally recognised standards.

The objective must be simple: understand the application before engineering the tyre.

INDIA HAS AN OPPORTUNITY TO LEAD

India’s manufacturing ecosystem is moving from being viewed primarily as a cost-competitive production base towards becoming an engineering and innovation partner for global markets.

For Indian tyre manufacturers, this creates a significant opportunity.

To compete internationally, however, we must benchmark ourselves against global standards – not only on price but on product consistency, technology, service, innovation and application knowledge.

At Rubber King, our international presence across more than 90 countries reinforces our belief that Indian manufacturers can develop products in India while competing confidently across global markets.

The next decade of tyre manufacturing will ultimately be about engineering confidence – confidence that a tyre will perform when the terrain becomes difficult, the load becomes heavier and the operating environment becomes unpredictable.

That is where manufacturing technology, R&D and customer understanding must come together.

Because the future will not always operate on perfect roads or predictable surfaces.

It will be built for the untamed.

RULE THE TERRAIN – Tyres for the Untamed.

The author is Entrepreneurial Founder & Director, Rubber King Tyre Group

The innovative, intelligent and integrated tyre manufacturing system marks a paradigm shift and is an indispensable tool for a fundamentally different vision of the future.

This model fosters a highly networked, data-driven and agile production environment and revolutionises traditional, labour-intensive manufacturing. This model must be combined and integrated with integrated product development, intelligent automation and data-driven optimisation.

In this model, tyre design, materials and manufacturing processes are controlled within a unified framework to achieve defined objectives. The model’s principle is based on a comprehensive and integrated development process, ensuring the achievement of consistent objectives tailored to the vehicle application, operating conditions and customer requirements.

The overall model digitally integrates and networks all phases of the tyre lifecycle, from the development and design of rubber compounds to product marketing. Data relating to design, manufacturing, testing and customer service are consolidated in a centralised and unified digital system.

This model resembles an autonomous system integrating AI and enabling the automation of repetitive tasks, predictive maintenance and real-time quality control without manual intervention. However, it already takes customer expectations into account from the design stage.

The ZC Rubber model represents a transition from theory to practice, requiring a top-down strategic approach that takes into account the product realisation architecture as well as the overall organisational culture.

ZC Rubber incorporates such a model, relying on platform-based strategies that directly leverage its proprietary X-Tech and Phecda Tech Systems. This provides an effective foundation for the continuous development of speciality tyres. The integrated system supports the development of original equipment and replacement tyres for the company’s three main brands.

ZC Rubber combines materials research, product development, manufacturing and validation within an integrated development process. This expertise enables faster product development, more consistent production and better alignment with the specific requirements of automotive platforms and markets. As a result, advancements in research and development generate measurable added value for automakers, suppliers, fleet managers, dealerships and drivers worldwide.

ZC Rubber’s model enables manufacturers to simulate production scenarios and identify bottlenecks at every stage of product realisation. It is not an isolated simulation environment but rather a deeply integrated, AI-powered development approach that directly links virtual design and testing with smart manufacturing.

AI models analyse data for predictive maintenance and for overall efficiency, detecting failures before they lead to costly production downtime requiring immediate intervention. With the emergence of trends such as AI-driven automation, latency is becoming an increasingly critical factor.

Since the 1990s, various shop floor management (SFM) systems have proven their worth and have been integrated into enterprise resource planning (ERP) systems. ERP is based on different manufacturing execution systems (MES), which utilise real-time information systems and embedded software, as well as programmable logic controllers (PLCs) and SCADA systems for control and data acquisition. For many years, SFM systems optimised production processes, minimised downtime and increased the productivity of tyre manufacturers. Today, however, the integration of all digital systems, including those involved in the product development phases, is essential.

For an integrated and efficient production model, latency – also known as ‘processing time’, i.e. the calculation or inference time of control systems – is of increasing importance in order to prevent malfunctions and ensure machine synchronisation. It must be virtually zero and is often measured in microseconds (μs) or milliseconds (ms) because industrial servers continuously monitor parameters such as vibration, temperature and pressure.

This is why the Chinese national standard for network architecture in tyre manufacturing mandates extremely low latency, less than or equal to 30 ms – a crucial factor for features such as remote monitoring and predictive maintenance.

Optical detection and image acquisition are playing an increasingly important role and are driven by AI-assisted feature extraction and deep learning systems. High-resolution cameras and laser monitoring systems control critical parameters in real time, such as tread and sidewall cross-section measurements, profiling and regularity, innerliner thickness mapping, bead geometry inspection and measurement of chafer thickness and width. The use of these models optimises the entire manufacturing process and ensures efficiency and precision.

Automated guided vehicles (AGVs) have been used for years in tyre factories to manage and ensure a smooth and efficient transport and flow of materials and tyres between workstations. More recently, autonomous mobile robots (AMRs) have emerged as intelligent tools capable of acting and moving independently, rather than simply being piloted. Their movements within the factory require minimal programming and intervention.

Tyre manufacturing systems are becoming more sophisticated and evolving with AI-powered automation. However, the overall production of the product is safer for long-lasting quality and for the benefit of customers…

For a long time, even a simple change in tyre size in factories required numerous manual interventions in different systems. Consequently, switching from one production plan to another, according to a given set of specifications, presents a classic challenge, as everything relies on the manual configuration of complex parameters, which generates a significant source of errors and scrap.

Following the successful integration of the intelligent and innovative production plan change management system, plan changes are facilitated by networking all systems via a Manufacturing Execution System (MES). Analysis of material consistency using Big Data enables automatic parameter adjustments. This simplifies processes, improves component stability and prevents material mixing errors during line changeovers.

Tyre manufacturing remains a traditional challenge; assembling dozens of components into a complete tyre is a labour-intensive process requiring numerous highly skilled workers. Autonomous tyre manufacturing machines operate without operators, utilising robots for material handling and positioning, thus ensuring high accuracy and repeatability.

The profile stabilisation time is crucial in the extrusion process for optimising the configuration and obtaining a stable, high-quality profile in just a few seconds. Artificial intelligence models analyse this stabilisation time with remarkable accuracy.

Dry cycle time (DCT) during tyre vulcanisation is crucial and a key area for continuous improvement. In a fully integrated, AI-driven tyre production system, vulcanisation parameters are optimised in seconds. This system ensures consistent production and prevents downtime through real-time alerts and near-instantaneous deviation correction. A powerful AI system simultaneously analyses data from over 250 vulcanising presses to identify the root causes of process variations.

A final tyre inspection system can use multiple high-speed laser sensors targeting key areas of the tyre. These sensors require microsecond-precise synchronisation to ensure simultaneous data acquisition from every point on the rotating tyre, creating a precise 3D map of the entire tyre. Intelligent 3D inspection sensors are equipped with integrated processors for instant quality control. They process high-resolution surface scans and determine conformity directly within the system.

The concrete and significant results achieved represent not just improvements but a true revolution in tyre manufacturing. Applying these principles, in line with industry averages, has increased productivity by up to 68 percent, reduced the defect rate by 57 percent and decreased inventory by 34 percent.

Integrated and automated quality control systems, which continuously monitor tyres, represent a true revolution in modern tyre factories. Manual quality control and material handling, which require significant human resources, can be replaced by up to 90 percent with intelligent systems in autonomous production systems. Finished tyres are transported to the warehouse by automated conveyors and software-controlled robotic handling systems.

A fully automated tyre manufacturing system allows for proactive intervention as soon as one parameter among thousands exceeds its control limits, thus preventing malfunctions before they even occur. In a networked system, real-time dashboards display live data to operators from mixers, timers and cutting machines, such as temperatures in temperature control unit (TCU) zones and dynamic pressure.

Automated production systems, combined with innovative, intelligent and integrated models, are particularly valuable for large production facilities. Modern tyre manufacturing goes far beyond mere ‘digitalisation’ or ‘Industry 4.0’, where even minor inefficiencies can lead to significant operational losses and customer dissatisfaction. Integration – from customer expectations to manufacturing control – enables the development and management of high-performing products with optimal overall equipment effectiveness (OEE).

Most of us know the alleged Chinese curse: ‘May you live in interesting times…’. This term, in fact, is not of Chinese origin: it was first used by a British diplomat in the late 19th century and is a kind of upper-class British joke.

And yet, as we look at the world today, in political, economic, technological and environmental terms, most of us would agree that the times we live in are far too ‘interesting’ for comfort. Predicting even the near-term future is becoming more difficult, while making rational longer-term investment decisions often feels like a high-risk gamble.

Managing uncertainty requires a very special set of skills – and uncertainty is exactly what the tyre industry is being asked to deal with right now. We can all make a list of the individual challenges we face, but perhaps the best and simplest way to define this issue is by saying that the business model of the tyre industry is in question.

CHALLENGES TO THE BUSINESS MODEL

The modern tyre plant is a product of globalisation. It depends on relatively open supply chains, predictable logistics, ready access to materials, affordable energy and steady demand for products. Unfortunately, these factors can no longer be relied on.

Mike Norman

The vehicle market is changing, notably by the rapid rise in demand for electric vehicles, while the number of tyre variants is also growing fast. We are moving to a market reality in which volume may stay more or less the same, but the number of different tyre designs is rising and the volumes per SKU are going down.

Globalisation has gone into reverse, with a rise in protectionism and tariffs, leading to ‘reshoring’ and a trend to more local production, based closer to the markets being served, enabling more agile response to demand.

A technology revolution is taking place, with automation altering the cost base and leading to a levelling up in quality – a process that has been going on for a long time. Price premiums across a wide range of market segments are starting to disappear because quality standards are now so good across the market that it is becoming harder to justify higher prices for ‘premium brands’.

We can all agree therefore that the industry is changing – but it is not so easy to define where it is heading.

THE SHAPE OF THE FUTURE?

There is overwhelming evidence that the tyre industry of the future will look very different from the industry of today. It is tempting to present a single model of the future and invite all the different industry players to plan their own roadmap to that single future. That would be a mistake – the industry is diverse and we think it will remain so. There is a clear direction of travel (towards more comprehensive automation, greater agility, lower energy use, ability to manage a greater number of variants, use of new materials, reduced environmental impact…), but the options remain broad and the future is still unpredictable.

VMI not only has a vision of the future but works continuously to develop innovative solutions that support the industry and its development. In fact, we have even successfully built a true single cell production platform. This is UNIXX, which is designed to make tyres within a single process, from initial compound mixing to the finished product. You can manage as many variants as you wish, because each individual product can be made profitably – a true ‘market of one’ approach. The footprint is very small, compared with current plants, and environmentally it is far more responsible, using less energy and with much lower levels of pollution.

Surely, this is where we should be heading? Well, perhaps it is, but life is not that simple. Every business has to start from where it is right now, which is why we celebrate:

THE IMPORTANCE OF EVOLUTION

In evolutionary theory, there is an ecosystem, which is a common space inhabited by many different species. They sometimes compete for resources, sometimes complement and help each other, while they all have to deal with bigger forces from the outside. In the distant past, these might have been volcanoes and meteorites, but in our case, the external forces are probably wars and tariffs.

The key is not to focus on a single image of the ‘perfect’ future design but to have the ability to evolve as the environment changes – and keep evolving. You must start from where you are today and then follow the logic of the market, emerging technology and your own strategic priorities. The result will be – as with natural evolution – a lot of diversity but with every player moving in a common direction: towards a future that is more automated, more efficient, more flexible.

So what does the market look like right now?

There is still that familiar divide between Tier 1, Tier 2 and Tier 3, but the old definitions and distinctions are no longer as solid as they once were.

Most Tier 1s are losing their price advantage, at least in certain markets, because the Tier 2s have now reached a comparable quality level. Tier 3 businesses are exploiting their generally lower cost base, combined with advanced, highly automated factories to build advantage in the market through a highly competitive price point. Each type of business has its own operational realities and long-term goals. They are all moving through their own evolutionary journey. The big question we at VMI ask ourselves is this: How can we help them all to develop as successfully as possible?

KEY LESSONS OF EVOLUTION

When you start a journey of change, there are some basic priorities that apply to us all.

Simplify and take out costs. To make sure that business change projects deliver real benefits, the first task is to take out cost and reduce risk by simplifying and accelerating your existing processes. Simplification will lead to reduced energy and materials use (saving money at once), fewer human touch points (also saving money) and potentially could enable you to reduce the footprint of your plant (freeing capital for productive investment).

Every year, VMI brings out new refinements to existing systems, solutions and investments, designed to improve performance and take out cost. Here are some of the most recent of these:

• Smart Splice Ply fits to existing VMI TBMs already on site to reduce variations in play and splices. It raises quality, saves material and speeds the process.
• Then there is OEE (Overall Equipment Effectiveness) Reporter, a purely software solution that identifies areas for process improvement for reasons that range from downtime to operator issues, with the aim of moving towards 100 percent effective operation.
• Perhaps the most exciting of these new developments is the Autonomous Materials Delivery (AMD) solution, which combines automated handling of compound rolls, Smart Run Empty (designed to cut out compound wastage) and interface with Automated Guided Vehicles.

AMD summarises the ways in which the operation of existing machines, investments and solutions can be continuously improved to reduce the need for human intervention, reduce machine downtime, cut down wastage and drive higher operational efficiency – all without disruption to business as usual while maximising the potential of existing investments.

This is the very definition of stage one in the evolutionary change journey: improve what you have and bank the savings for reinvestment in the future.

Implement new technologies, one by one. We understand there can be no ‘big bang’ changes in the tyre industry, but we can start to profit from the most advanced new technologies today without the disruption that wholesale change would cause, adding new concepts alongside existing investments in the second stage of evolutionary change.

In some cases, this makes it possible to close down existing processes completely, making machines redundant and delivering significant savings. In others, we can eliminate specific stages in a process, again leading to simplification, higher quality and cost reductions. Here are two examples:

• UNIXX Beltmaker (now with hot gum strip feature) carries out most of the activities of a traditional calendering line but faster and more efficiently. Given the size and high energy use of calendering in tyre plants, the potential for reducing plant footprint and energy costs is enormous.
• VMI’s new Strip Winder, again developed for UNIXX, is now available for evaluation and review, with the potential for simplifying some aspects of production while offering a number of quality and design advantages.

This is a technique that many companies have struggled to master but which is fully operational right now. You can see it for yourselves, as well, because VMI’s mobile Strip Winding roadshow will make it possible to watch, test, examine, ask difficult questions and prove for yourselves that it works.

Extend the scope of automation. Industrial automation is what VMI stands for, so moving to the next stage is not a break from the past but an evolutionary move. As part of the TKH Group, VMI is now not just benefitting from its own in-house (but globally located) R&D activity but is also building on the AI capability inside the Group.

There are some aspects of AI that attract some scepticism (rightly), but industrial automation is the most natural development of AI – and VMI is driving it forward at speed. During the rest of this year, we will complete development work on a decision support GenAI-enabled system that will make it easy for operators to optimise machine performance while giving assurance to employers that the operators themselves will be able to work more efficiently.

This will be just the first step in a process of continual evolution, in which machine intelligence will be exploited in more intuitive ways to enable faster skills development, deeper insights and eventually lower requirements for human intervention at all. Current VMI solutions already include advanced sensor arrays, pattern recognition (for anomaly detection) and machine learning. Many of the key elements of true AI are in place, therefore, and development has started to accelerate!

Move towards the Dark Factory. The end point of industrial AI, as defined by industry leaders in other sectors, is the idea of Autonomous Production, sometimes known as the Dark Factory – not just hands off, eyes off, to use VMI’s familiar mantra, but lights off, too!

We think use of AI in this context is the most important of all evolutionary steps, as it enables tyre manufacturers to start gaining cost and agility benefits fast while closing down redundant processes and hardware in their own time. To be clear, there will remain major differences in scope, size and potential between different industry players in the age of AI, but implementing a governing intelligence, end to end, will be common to all.

STARTING THE JOURNEY

All of us have our own individual, evolutionary journey. The key objective for every business leader in this complex, global industry is how to build their own roadmap to the future. There is no longer any question about whether we need to change or not – we certainly do – but we have no choice about where we start from. Our starting position also defines our short-term objectives.

Our conclusions are simple but – we think – unavoidable.

• Change is coming for us all. We have the option of choosing our own path and our own priorities. But not of standing still.
• Change is not just about technology: it also covers the organisation, people, partners and customers. Technology might be powerful, but if you can’t find the skills and budget to implement it, then it remains theoretical.
• AI is not a magic bullet: this simple term covers a complex suite of capabilities and techniques that need to be understood in depth and implemented with care.
• All change processes follow the same basic rules and stages. Simplify and save money now; mitigate risk and be able to stop and go back if needed; test new concepts one by one and don’t go onto the next until you have mastered the first.

The journey is what matters, and you will need a map, guidance, partners and friends to make the journey both safe and productive. It’s not revolution but evolution: that is the word that defines both the challenge and the way to make change work for you. 

The author is the Chief Commercial Officer at VMI. 

As a surviving member of the ‘baby boomer’ generation that commenced with the rapid economic growth following the World War II, I think we are, in a broad sense, privileged to have witnessed and experienced the happenings and consequences of about 50 years in the 20th Century and about 30 years in the 21st Century. When contemplating on the term literacy and its traditional meaning of being able to read and write from an educational perspective, I feel it fitting to cite a few real-life cases, from way back, which make me to wonder whether the above interpretation of literacy is all encompassing.

a) My maternal grandmother, who was born in 1900, did not know reading or writing, a typical feature about the female folk in that era, especially in the remote villages. Despite this apparent handicap, she successfully managed the day-to-day administration of the paddy fields and the rubber plantation, including finances, and raised three children to become worthy human beings.

b) Then there were these three young people who had migrated to Colombo with minimal formal education and started their business in humble ways to become well recognised icons of international fame in the healthcare, confectionary and rubber footwear and tyres, respectively, the latter being related to my own core field, the rubber industry.

c) Last but not the least, the late Martin Wickremasinghe, born in the late 19th century, who attended school only up to the 7th standard, wrote hundreds of books on diverse subjects such as history, anthropology, sociology, religion and literature and several novels (some of which were translated to several languages), which rightfully recognised him as a well-respected scholar and the greatest writer in Sri Lanka.

While it may be futile to compare apples with oranges, I feel that literacy has a utilitarian perspective, which can change with the social context and the circumstances. With my manufacturing background, I see a close parallel of literacy and quality. Out of the hundreds of definitions available of the latter, ‘fitness for use and the level to which requirements are fulfilled’ is applicable to literacy as well.

When going through the available information on the subject, it is noted that ‘literate’ can be traced back to the early 15th century from the Latin word literatus, meaning learned, educated and lettered. Initially, literate meant someone who was well educated, learned and acquainted with literature, and over time, as basic schooling became more widespread, the word was adapted to describe the foundational skill of reading and writing. The Oxford Advanced Learner’s Dictionary defines literacy primarily as ‘the ability to read and write’. Two core definitions for the term are identified as Basic Literacy, the fundamental ability to read and write, and Specialised Literacy, the competence, knowledge or skill in a specific subject area in which common modern applications include:

a) Computer literacy: The ability to use computers effectively.

b) Financial literacy: Understanding and effectively managing personal finances.

c) Health literacy: The capacity to obtain, process and understand basic health information and services.

It could be inferred that we, the ‘baby boomers’, currently at an advanced stage in life, cannot do without the above basic literacies, and as a minimum, the routine health check such as blood sugar, blood pressure, LDL and HDL etc. to survive and lead active lives.

It is said that writing originated primarily out of economic necessity as the early agricultural societies grew and needed to track goods, taxes and trade. The evolution of writing from rudimentary clay tokens in to the world’s first independent writing systems in Mesopotamia, Egypt, China and Mesoamerica around 3200 BC to 3000 BC is a story that requires a deeper elucidation at a different forum.

Literacy is considered as one of the most important foundations of civilisation and has played a crucial role in human survival and existence both evolutionary and historically. However, instead of going into a deliberation of these foundational perspectives, I intend to offer some of my personal insights and recollections on this important subject over the past 60-plus years. I can recollect how at preschool stage, we were initiated into the basics of reading and writing using slates and slate pencils (made out of a silicious material) and the ‘black boards’ in the class room where chalk was used for writing. Literacy mainly meant the ability to read and write and, in later classes, in performing basic arithmetic. In schools and workplace, literacy was closely connected to formal education and subject knowledge. A literate person was one who could understand written communications, reads books and newspapers, write letters and maintain records and perform effectively in society. It was directly connected to social respectability and economic progress.

Literacy in English was considered as a rare virtue in countries which were under the British colonial rule. It was confined only to a few ‘high level’ schools in Colombo and in some major towns. Hailing from a rural background and having attended a small primary school in a remote town, I have first-hand experience of the panic and inferiority when I started secondary education in Colombo. This was especially true when we started studying for the Government (Ordinary Level Exams) in the science stream which was all in English. It was a struggle to get adapted and face the challenge, which I would say, I managed fairly well.

In those days, literacy was essentially confined to formal education and subject knowledge. Students were expected to memorise facts, understand texts and reproduce the information during the examinations. Books and libraries were the main sources of knowledge. Teachers were well recognised and respected as the primary sources of knowledge. And learning was generally a disciplined and structured process. And information, though limited, was relatively organised. I do not consider this as a deficiency or a weakness at all, because it fitted well with the societal and business expectations of those days.

I can well remember the day of my first interview seeking a job, which happened to be in the rubber industry. Instead of asking about isoprene or how the RSS (Ribbed Smoked Sheet) is made, although I managed to cram some information about the latter, I was asked about Ohm’s Law and how steel is made from iron ore. I was lucky because in our Advanced Level class, we had studied the above, and this paved way for a lifelong career in the rubber industry.

Literacy seems to be directly proportional to the rate of percolation or trickling down of the technologies to countries in our part of the world, and this was a rather slow process until the early eighties. However, mankind is evolutionary geared for ‘adaptive radiation’, which in modern jargon can be interpreted as how quickly we learn and get used to the new situations and contingencies as we meet new frontiers. According to the modern theories of cognitive learning, we acquire new knowledge through assimilation of new concepts (schemas) or by accommodation of incoming concepts into our existing knowledge. As an example, I can relate with my personal experience how my literacy in rubber technology evolved, starting as young trainee with very little knowledge on rubber. With the rapid development of science, technology and globalisation and artificial intelligence, the meaning of literacy has expanded beyond the traditional horizons.

In contrast to the scenario of over 50 years ago, today’s literacy has grown to include cultural awareness, ethical understanding, workplace competence, computer literacy, digital communication and the ability to manage continually increasing volumes of information; some of them are very often recurring and sometimes redundant. Some key diversions are shown as follows:

a) Educational and subject literacy: While mathematical and scientific literacy, language proficiency and analytical thinking is essential, they go beyond memorising facts to effective application of the knowledge.

b) Cultural literacy: This has become increasingly important in this era of extending globalisation for respectful understanding and effective communications. This also includes awareness of history, religion, social values and traditions, which lamentably is declining amongst the younger generations.

c) Ethical literacy: This simply means the ability to distinguish the right and the wrong, social responsibility and taking morally sound decisions. Ethical failures can cause serious and disastrous consequences at the work place or the society.

d) Workplace literacy: Today’s workplace literacy includes communication skills, teamwork, time management, leadership, and most importantly, emotional intelligence and empathy.

Cognitive overload is another major challenge in this era of information wilderness where virtually every perceivable member of the community is inundated with vast volumes of information every moment, which often creates confusion. The human mind has limited capacity for attention and memory. Continuous digital distractions can weaken concertation, reduce reflective thinking and may affect mental wellbeing.

While the meaning of literacy has undergone a remarkable transformation over the past 60 years or so, the digital age has created opportunities as well as unpresented challenges. Modern literacy requires not only access to information but also the wisdom to evaluate, analyse and apply it effectively. Books, reading habits, reflective thinking and reliable sources of knowledge remain essential even in the era of artificial intelligence.

For many years, literacy and competency have been considered as different subjects. However, in the modern world, the demarcation between the two have been gradually getting blurred. Literacy does not simply mean how much one knows but more on how the knowledge is applied for value creation. This convergence is evident in all walks of life. Employers are increasingly seeking persons who can demonstrate competence rather than merely possessing qualifications. Competency-based education has entered the curricula of many private and governmental institutions in Sri Lanka. Conventionally, Sri Lanka is said to possess one of the highest literacy rates in the region. However, the progress achieved in many aspects of socio-economic, ethical and cultural fronts do not seem to have a matching congruence with competency.

As the American writer, futurist and businessman Alvin Tofler (1928-2016) once quoted,

“The illiterate of the 21st century will not be those who cannot read and write, but those who cannot learn, unlearn, and relearn.”

The meaning centres on the shift from static knowledge to the critical need for constant adaptability in a rapidly evolving world.

The author is a Management Counsellor from Sri Lanka.