When we discuss about a motorcycle's performance, we generally speak about its engine power, torque, top speed, how fast it can accelerate, vehicle sound etc. Nevertheless, all these are meaningless if a driver cannot control the machine and/or is not comfortable while riding. There comes the importance of tyres. Tyres are the most crucial parts of a vehicle suspension system.  Tyres are the only component in a motorcycle that constantly stays in contact with the road. The part of tread which is in contact with road surface is called ‘contact patch’ & Is about half the size of a post card.  The overall suspension system (including tyres) ensures the right contact between the tires and the road surface at every stage of driving, thereby ensuring stability and good handling of the vehicle.

As tyres are the only contact with the road, they are responsible for multiple functions, such as –

Transfer the engine power to the road- meeting the demands of acceleration and braking

  Provides right hold (grip) on different surfaces like dry, wet, snow, loose soils etc.

  Helps the rider to steer the vehicle by responding to the handle movements

  Carry the weight of the vehicle & rider

 Ensuring the comfort of the rider by absorbing and dampening shock

Apart from the above aspects, tyres play a vital role in vehicle aesthetics, safety, fuel efficiency etc. These and several other challenges make Motorcycle tyre design a very interesting and responsible subject.

Apart from being a crucial part of a vehicle suspension system, tyres are the only contact between vehicle & road. Motorcycle vehicle dynamics and control characteristics are highly influenced by the tyre design. It is therefore highly imperative for a vehicle chase/suspension designer & tyre designer to work together in tandem. This will ensure that the part designs will complement each other and deliver the characteristic target performance of a motorcycle. A robust interaction mechanism between the R&Ds of OEM [Original Equipment Manufactures] and tyre manufactures is a growing necessity to cater to the ever‐increasing demands of performance entrusted upon the tyre of today. In case of tyres getting designed exclusively for aftermarket, a tyre designer work closely with the vehicle dynamics team to ensure that the retrofit design delivers desired target performance of the vehicle

Some of the major steps involved in motorcycle tyre design are

 Product planning & Tyre “Size” finalization: During this stage a vehicle designer & tyre designer jointly review the vehicle performance requirements and decides the parameters specific to tyre performance. This includes:

Defying the application /terrine: Depending on application, 2 wheelers maybe broadly classified as Sport, Cruiser, Choppers, Touring, scooter, Step through, Sport touring, Enduro etc. Different OEM’s follow different terminologies, but a for a tyre designer to understand the final use by the user is of utmost importance. Demands from a tyre varies with each vehicle category, for example, for a cruiser the tyre is designed to be robust so as to hold up the weight of such heavy bikes and deliver long tyre life, whereas for a Sport touring /super sport bike, tyres are  designed to deliver quick and precise handling with superior grip. These tires are lighter and made by using softer compounds for Superior grip.

Selection of Bias /Bias belted / Radial:   At this juncture, I am not going to delve deeper into a detailed comparison of these constructions – however, it is important to acknowledge that both these construction types have their respective advantages and disadvantages. Each of these constructions has few specific applications where one performs better than the other. The selection of construction type mainly depends on vehicle category (application), vehicle Speed, load on the tyre, stability requirements, handling requirements, etc. for example Bias tyres are used in medium speed but heavy weight vehicles owing to their sturdy sidewalls, whereas Radial tyres are the ideal choice for high speed , vehicles because of their superior dimensional stability.

Selection of Tube type Vs Tubeless:  Functionally both types of tyres have a proven track record for almost all applications. Hence this choice mainly depends on vehicle Rim design, which is decided by the overall aesthetic demand & application of the motorcycle.For high speed application, tubeless is always preferred

Finalizing the Tyre size / Tyre Geometry:  In general, we may call it as tyre “size” – which includes tyre width, tyre diameter, rim diameter etc. Tyre geometry affects the vehicle dynamics like caster, trail, vehicle Center of gravity [CoG], etc. It also influences the area of contact between vehicle and road surface under different riding conditions & load-carrying capacity of the tyres. Furthermore, tyre size significantly influences vehicle aesthetic as well.  Tyre “size” and vehicle rim size are always interconnected. Decision on one influence the decision on the other.  Usually motorcycles have different front and rear tyre sizes depending on vehicle geometry & load distribution. Tyre “sizes” are decided considering all these parameters & the designers ensures that it follows the standards’ guidelines applicable in target countries.

Tyre tread profile design:

Contrary to the passenger car tyre designs which have almost flat tread surface, motorcycle tires have a U-shaped profile and a contact patch that changes size and shape during cornering. There is a major difference in the way lateral force is built up in passenger car and two wheelers.  In case of passenger car, mechanism of lateral force builds up is due to slip angle whereas in two-wheeler it is mainly because of the camber or the leaning of the vehicle.  Hence you see a flat tread area for passenger car tyre and U-shaped profile for Motorcycle tyre

This U-shaped profile is an important design factor having a direct influence on vehicle performances such as drivability (handling) durability, ride comfort, noise and wear resistance etc.

These tread contours are designed as the arc of one radius, or a combination of arcs with two or more radii. These profiles ensure the required contact patch availability at different lean angles & are controlled by the lean characteristic of the vehicles. It is very critical to balance the performance of front tyre & rear tyre of s motorcycle for precise handling of the vehicle. The contour designs play an important role in front /Rear tyre balance.

Tyre tread pattern design:

Patterns are molded in the tread area of tyre by repeated arrangement of ‘Groves’ or ‘Blocks’ & are generally referred to as “tread pattern”.

Significance of tread pattern: 

Tread pattern plays a vital role in tyre performance such as:

Optimizing the traction on the riding surface

Eliminating aquaplaning

Optimizing the” Wear” of tread area·  

Ensuring the continuity of tyre performance at different wear Stages [ wear %] of tyre.

Rolling resistance of the tyre

Noise generation

roviding a measurable clue to the owner on time for removal /suitability for continuous usage. etc.

Tread patterns not only helps in achieving the target performance, but also impart unique look to tyres and enhance aesthetics

Tyre patterns are broadly classified into 4 Major headings

• Rib patterns
• Directional
• Block [ Knobby]
• Slick tyres [Pattern less]

Selection of which group of patterns is mainly controlled by the terrain of application, e.g. Directional patterns are preferred in paved roads and knobby pattern ae mainly used on off-road applications. Pattern less tyres are normally used in racing track applications to provide maximum traction.  Vehicles are designed to work in a combination of different terrains – similarly, tread patterns also have subgroups– which are optimized to operate in different combination of terrains. E.g. Semi knobby patterns for on – off allocations, High land – minimum grove patterns for Supersport highway applications etc.

Designer alter the direction of the grove, depth of the grove, number of groves, the ratio between Grove area & non grove area [ Land- sea ratio] , shape of the grove, the width of the grove etc. to optimize the performance of tread pattern. These patterns are designed to perform under different dynamic conditions. Nowadays designers seek the help of computer-aided simulations to predict the performance under different loading /riding conditions to optimize the pattern design.

Tyre as an Aesthetic component

The visual appeal of tyre is significant contributor in the overall aesthetics of a motorcycle. Hence in addition to performing all the functional requirements discussed so far, tyres ought to look good too.

The tread pattern should complement the overall styling language of a motorcycle. This attracts the attention of OEM’s vehicle styling studios towards tyre tread designs as well. In fact, most of the new tyre designs are done first at styling studio and then technically optimized by the tyre engineer to guarantee the functionality.

Material design

Tyre is a composite material made of different rubber compounds and reinforcing materials. Right compound and reinforcing material selection are crucial to achieve the target performance of tyre.

• Reinforcing materials:

Reinforcing materials provides the required strength and stiffness for tyre body [carcass]. This includes “tyre cords” used in tyre body ply & “bead wires” used in bead construction of tyres. Most used tyre cord materials are Nylon 6, Nylon 6-6, Polyester, Aramid, Rayon, Steel, etc.

These materials differ in their chemical composition, tensile strength, elongation properties, impact strength, temperature resistance, rubber adhesion, etc. Tyre engineer must choose the right tyre cords depending on the performance demands of the tyre like load carrying capacity, durability, impact resistance, drivability, speed of operations etc. Cost & availability also are few decisive parameters during selection of reinforcing materials.

Tyre Cord denier, cord style, EPI (Ends Per Inch), angle of cords and number of plies affect the strength of a tyre and are chosen based on engineering, and design criteria.

structural durability of a tyre is Primarily determined by the reinforcing material

• Rubber compound design

Each part of the tyre must dispense different functions and are thus designed with different rubber compounds like tread compound, sidewall compound, carcass compound, bead wire coat compound, etc.  Though all these compounds have their own importance, but tread compound selection is the most critical, as it has a direct impact on tyre traction, handling, wear performance, durability, rolling resistance, etc.

• • Trends of tread compound design:    

Even though smaller number of components are used in a motorcycle tyre, than as compared with passenger car tyres, but performance challenges involved in compounding are far more complex considering less area of tyre in contact with road. 3 major performance requirements in motorcycle tread compound are (1) Grip (2) Rolling resistance [fuel efficiency] and (3) Tyre life which is generally referred as the magic triangle in tyre rubber compounding. This is due to the contradictory response of these 3 performance characteristics to rubber compounding approach. For example, improvement in Grip normally comes with an increase in rolling resistance with conventional compounding as both are related to energy loss. It is always a challenge for tyre compounder to improve all three performance requirements together and this calls for the incorporation of advanced polymers and fillers.

Performance priorities for tread compound changes based on operating terrain, type of vehicle, etc. e.g. Street two-wheeler tread compound designs primarily focus on high grip and high-speed capabilities, whereas an on-off application tyre require higher cut and chunk resistance tread compound.

Demand for lower rolling resistance tyre is showing a steady increase Year-on-Year. Major divers for this growing demand are Electric vehicle introduction & increased focus on vehicle fuel efficiency, in few segments. Tread compounds are expected to deliver lower rolling resistance, without compromising the Grip – typical “magic triangle” puzzle for any tyre compounding engineer. Tyre industry can address this challenge by usage of new generation materials like SSBR, functionalized SSBR, high molecular

Design for manufacturing

For success of any product – Design & manufacturing sync is a must. While designing, to accommodate all functional requirements, a designer cannot ignore the significance of manufacturing process. Hence every tyre design is optimized to satisfy both functional & manufacturability needs. This if not done properly may result in suboptimal performance of the product,

Product Performance Testing

It’s important to review and verify the product performance before releasing it into the market. There are a set of Indoor & Outdoor tests for performance review. A few of them are listed below,

Indoor tests: High-speed drum test, Endurance test, Rolling resistance test, Force and moment testing, Stiffness test, Footprint etc.

Outdoor tests: Ride and Handling testing (track, off-road, public road etc.], Braking test [wet, dry], tyre wear test etc.

Blend of Engineering & Art

Being an integral part of vehicle suspension system & only contact point with road, a tyre plays significant role in motorcycle performance [safety, drivability etc.]. In addition to these performance parameters, tyres have significant influence on the overall styling of the vehicle. It complements the primary theme of the vehicle. A right blend of engineering and art is essential for a successful tyre design. One cannot substitute the other. Amongst different steps of tyre design like, dimension finalization, tread design & martial design etc. the most critical step is tread design (profile, pattern & compound)

Few areas designers are focusing today to  meet the near/middle future demands are

• Lowering the rolling resistance – without compromising grip
• Shortening the time to market.
• virtual simulation of tyre performance

 

References

1.  ‘’The pneumonic tyre’’, National Highway Traffic Safety Administration, Feb 2006
2. T. French, Tyre Technology, Hilger, New York, 1989.
3. Mechanics of Pneumatic Tires, S. K Clark, ed., University of Michigan, US Department of Transportation, National Highway Traffic Safety Administration, Washington, DC, 20590, 1891.

     4.  Handbook of vehicle-road interaction: vehicle dynamics, suspension design, and road damage / edited by David Cebon. p. cm. - (Advances in engineering), ISBN 9026515545

    5. “Tyre and Vehicle Dynamics” , Hans B. Pacejka,  Professor Emeritus Delft University of Technology, Consultant TNO Automotive Helmond

     The author is General Manager - Product Development,2&3-Wheeler tyres, CEAT Tyres

The order book for Curemaster is strong with a surge in orders during the first two months of the year. The executive anticipates continued momentum throughout the year, driven by increasing global demand for advanced, sustainable curing solutions.

FORWARD INTEGRATION

According to Rudman, digitalisation is playing a crucial role in enhancing the efficiency and reliability of curing presses. “Digitalisation provides real-time visibility into production processes, allowing manufacturers to monitor efficiency and product quality continuously. With a clear overview of operations, manufacturers can identify inefficiencies and ensure production targets are met. The HF XPLORE digital portal offers access to critical data at all times. It provides insights into machine health, predictive maintenance alerts and production performance. The system helps track efficiency, detect potential failures and optimise operations by identifying areas for improvement,” he said.

Artificial intelligence is also slated to play a key role in electrical heating, ensuring stable temperature control within the platens. Machine learning is being developed for predictive maintenance, helping to forecast bladder life and detect potential failures before they occur. These technologies are part of the company’s development roadmap, focusing on improving reliability and efficiency in curing press operations.

He also noted that as tyre compounds evolve, curing requirements will change, making electrical curing a more suitable solution. Unlike steam-based systems, where temperature is directly linked to pressure, electrical curing allows independent control of both factors. This flexibility is crucial for processing new materials that may not tolerate traditional curing conditions.

“In steam curing, the relationship between pressure and temperature is fixed. For example, achieving a temperature of 200 degrees Celsius requires increasing the pressure to 20 bar. With electrical curing, temperature and pressure are completely separate, enabling curing at lower temperatures while maintaining the necessary pressure levels. This capability is particularly significant for future materials, which may require curing at 160 degrees Celsius but at much higher pressures,” explained Rudman.

The shift towards electrical curing is expected to gain momentum, particularly for high-end and specialised tyres that demand more advanced curing strategies. While steam curing will continue to be used for lower-segment applications, the upper range of the market, especially where sustainability and material innovations are key factors, will require the precision and adaptability that electrical curing provides.

OVERLAPPING TECHNOLOGIES

There is a clear trend in the market where customers are seeking more customised solutions rather than standard off-the-shelf curing presses. Manufacturers now have unique requirements including features like electrical curing, digitalisation, automated loading and unloading and seamless integration with factory infrastructure and tyre transportation systems. As a result, the demand for tailored solutions is increasing, making flexibility a key factor in the adoption of new curing technologies.

“Curemaster is designed with upgradeability in mind, ensuring that tyre manufacturers do not have to replace entire presses when looking to modernise operations. Even older HF curing presses that have been in service for more than 20 years can be upgraded to electrical curing without altering the mechanical structure. This allows manufacturers to transition to more efficient curing technology while retaining the existing equipment. At the same time, the new Curemaster is available as a fully electric system from the outset, offering a ready-made solution for greenfield projects,” averred Rudman.

Nonetheless, the biggest business potential currently lies in retrofitting existing curing presses rather than selling entirely new equipment. “Many customers prefer upgrade kits that allow them to transition to electrical curing while maintaining current production setup. While greenfield projects present a significant opportunity for new fully electric presses, the greater demand at present is for retrofit solutions, as it provides a cost-effective way to improve efficiency and sustainability without major infrastructure changes,” he added.

PROCESS OVERVIEW

Most curing press suppliers have introduced electrical curing solutions. There are two main approaches to electrical heating, which are electromagnetic (induction) heating and resistive heating.

Electromagnetic heating method involves placing a coil outside the tyre to generate heat. However, there are concerns about how this method interacts with the tyre’s internal bead wire and breaker package. Since the long-term impact of electromagnetic fields on tyre integrity has not been fully tested or verified, there are still some uncertainties regarding its effects on tyre quality.

In contrast, resistive heating, which the company employs, places coils directly inside the plate, ensuring controlled and targeted heating. This method eliminates any risk associated with electromagnetic interference and allows precise temperature application only where needed. While both technologies are viable, resistive heating offers greater reliability and consistency in maintaining tyre quality.

“One of the key advantages of electrical curing is its rapid heating and cooling capabilities. The nitrogen used in the process can be heated from 20 degrees Celsius to 250 degrees Celsius in less than 20 seconds and cooled back down in the same time frame. This is achieved through continuous nitrogen circulation, where the system directs the flow through either the heater or the cooler as needed. In terms of curing time, electrical heating currently matches steam curing with a typical cycle of 10 minutes per tyre. However, there is significant potential to reduce curing time by 10 to 15 percent as electrical systems can operate at higher temperatures and offer more precise control over the process,” informed Rudman.

Nonetheless, steam curing has a predominant risk of mishaps in the bladder, which could lead to an explosion. The Curemaster is designed with a fully encapsulated dome, ensuring that any pressure build-up remains contained. If a failure occurs, the pressure is released downward instead of sideways, reducing the risk of injury.

The locking system is also unique. Even if there is a total power or hydraulic pressure loss, the press cannot open unintentionally. This containment and locking mechanism ensure a high level of safety during operation.

CHALLENGES AND OPPORTUNITIES

According to the executive, the biggest challenge in the curing press business comes from cost competition as lower-cost manufacturers pose a significant pricing challenge. However, from a technological standpoint, the company offers unique features that set it apart from competitors. While competitors may have cost advantages, HF’s focus on advanced technology, automation and digitalisation allows it to capture market share by offering superior functionality and efficiency.

The passenger car and truck segments remain the company’s primary focus owing to the highest growth potential. Additionally, the company sees an emerging opportunity in motorcycle and bicycle tyre curing, particularly with electric heating technology. HF is among the first to introduce electrical curing for these segments, positioning itself as an industry leader.

While HF is active in the passenger and truck segments, it has opted not to enter the off-the-road tyre market due to its relatively small size and intense competition. The segment still relies heavily on traditional mechanical presses, making it less attractive for innovation-driven solutions.

The company continues to refine the Curemaster lineup by introducing new materials, insulation techniques and design concepts. The company is particularly focused on increasing automation to enhance efficiency and reduce operational costs.

Beontag, one of the world’s largest manufacturers of self-adhesives and smart tags such as RFID, NFC and BLE, has entered into a collaboration with Kumho Tire to develop RFID-enabled tyres for commercial and passenger vehicles.

The partnership will see new Kumho tyres use Beontag's TyreTag RFID technology. Traceability will be possible with the RFID-enabled tyres from the point of origin to recycling and disposal. Following years of research and development, according to both the companies, the new RFID-enabled tyre is very robust and dependable, able to survive high temperatures and pressures over the course of years of intensive use. The new TyreTag-enabled tyres' traceability will also adhere to the forthcoming Ecodesign for Sustainable Product Regulations (ESPR), which will need Digital Product Passports (DPPs) and be in force for tyres starting in 2028–2030.

Thiago Horta, Global VP of Digital Transformation, Beontag, said, “We are extremely proud to share what we have achieved in our partnership with Kumho Tire. Through rigorous testing, we have worked hard to develop the necessary technology and durability capabilities in these RFID-enabled tyres; I look forward to continuing this journey with Kumho Tire for years to come”

Jihon Park, Assistant Manager with Kumho Tire, said, “Kumho Tire has been producing RFID-enabled tyres since 2013. Beontag’s technical expertise and collaborative approach were instrumental in helping us meet our rigorous standards and enhance our technology. We look forward to delivering even greater quality and reliability to our customers around the world.”

Goodyear has launched the Value Simulator, an online tool designed to assist fleet operators in visualising the possible financial and environmental advantages of upgrading their mobility and tyre solutions. The simulator is now available on the company's truck tyre website and is a component of Goodyear Total Mobility, the company's end-to-end solution for commercial fleets.

According to Goodyear, the tool takes into account typical fuel consumption and cost, fleet size and breakdown frequency, vehicle mileage and maintenance trends and the kind of transportation and route profile. After data is entered, the simulator instantly estimates the potential decrease of CO2 emissions, maintenance and fuel costs, and annual breakdown-related cost savings. Additionally, customers can customise simulations according to their own fleet characteristics.

The CO₂ reductions are based on theoretical fuel usage using EU tyre label values as a baseline; real savings may vary depending on factors including driver behaviour, vehicle condition and road conditions. Additionally, based on user interaction, the simulator suggests appropriate Goodyear goods and services. These recommendations can be used as a springboard for talks with Goodyear's staff in order to do a more thorough study and develop a customised fleet plan.

Maciej Szymański, Marketing Director Commercial at Goodyear EMEA, said, “At Goodyear, we are committed to supporting transport fleets in maximising efficiency, increasing competitiveness and promoting sustainability. The Goodyear Value Simulator confirms our dedication to customer-centric solutions and helps fleet managers to make informed decisions that aim to drive tangible benefits for their operations. With the Goodyear Value Simulator, fleets can visualise the potential financial and environmental impact of adopting Goodyear Total Mobility. From reducing breakdown costs to enhancing fuel efficiency, our solutions are designed to deliver real value to our customers.”

Webfleet, Bridgestone’s globally trusted fleet management solution, has launched its new flagship Driver Terminal, the PRO X, designed specifically for truck and van fleets.

By providing direct tablet access to Webfleet fleet management services, the PRO X links drivers and companies to streamline work administration. Fleets can utilise a variety of sophisticated Webfleet features, such as workflow management, electronic Proof of Delivery (ePOD) and two-way communication between drivers and fleet managers thanks to the pre-installed Webfleet Work App. They can also access other Webfleet services, such as Cold Chain, Remaining Drive Times and OptiDrive ranking, which allows drivers to view peer performance.

Van and truck fleets may enjoy the best-in-class professional navigation with the newest technology, like smart warnings for traffic or low-emission zones, major points of interest for trucks and EVs and live ETA reporting, with easy access to TomTom GO Fleet.  Additionally, when paired with OptiDrive, the motorist gets immediate feedback to help them drive better. Pre-installing maps is now simple, and they are updated automatically every month. With its wide anti-glare screen, sturdy construction, detachable battery and user-friendly controls for instant access to essential programmes, the new high-performance Driver Terminal helps professional drivers both in-cabin and on-site.

With an integrated Mobile Device Management (MDM) system that enables fully remote management of the devices' home screen, app auto-start and other features, it is configured for a quick roll-out in the field and can be tailored to fit various corporate demands. Because it is Android Enterprise Recommended and integrates Webfleet's and TomTom's expertise in sophisticated navigation, devices may be more rapidly customised to meet user demands. Beginning in March 2025, the PRO X will be sold in Europe, Australia and New Zealand, with other territories to follow later this year.

Annick Renoux, Vice President, Webfleet Europe, said, “At Webfleet, we are always committed to delivering smart solutions that enhance the working conditions and safety of our customers and their drivers, powered by the latest technology. That’s why we are proud to introduce the new PRO X – now with even more functionality to help fleet managers streamline their operations, boost efficiency and strengthen their connection with field teams like never before.”