How To Identify an Asymmetrical Tyre from a Symmetrical Tyre Pattern
With a huge variety of tread patterns and sizes, tyres come in a wide variety of designs, but they can all be narrowed down to three main types: asymmetrical, symmetrical (also known as multi-directional) and directional.
You may be surprised to learn that not all tyres are equal. With a huge variety of tread patterns and sizes, tyres come in a wide variety of designs, but they can all be narrowed down to three main types: asymmetrical, symmetrical (also known as multi-directional) and directional.
Symmetrical tyres, as the name suggests, have a symmetrical tread pattern that is the same on both the outer and inner sides of the tyre. This allows the tyre to rotate in either direction, and it can be fitted at any of the four positions on the vehicle without problems. The simple tread pattern makes them cheaper than the other options, but they are also less adaptable to varying road and weather conditions. They used to be commonplace, but nowadays tend to be used for town and city driving. Since they are multi-directional, there is no right or wrong way of fitting them to the vehicle.
Asymmetrical tyres use different tread patterns on the inside and outside edges of the tyre to great effect. Large blocks on the outside edge of the tyre provide excellent traction in dry conditions, and with a large contact area they give good road handling. Smaller tread blocks on the inside edge of the tyre give superior grip in wet conditions, with an increase in the number of grooves serving to displace water efficiently on wet roads. This reduces the chances of aquaplaning, where the tyre skates on water rather than gripping the road's surface. Provided that the larger tread blocks are positioned to the outside, asymmetrical tyres offer unrivalled grip and roadholding in all weather conditions for a safe and secure drive.
Asymmetrical tyres always have the words 'inside' and 'outside' stamped on to the sidewalls to ensure that they are correctly positioned on the vehicle. Fitting asymmetrical tyres the wrong way round compromises the tyre's ability to cope with road and weather conditions correctly.
Directional tyres usually have an arrowhead pattern that is designed to rotate in one direction only for optimum performance. When correctly fitted they ensure excellent road holding, even under the wettest conditions, with superb traction. Because of the level of grip they provide, even on wintry roads, they are often used as winter tyres. In order to achieve the desired level of grip, directional tyres must always be fitted correctly, with the stamped arrowhead on the sidewall facing in the direction of travel.
About the author
David is the National Retail Operations Manager for Protyre. One of David’s areas of responsibility and expertise is dealing with the DVSA and MOT’s for Protyre. As the Authorised Examiner Designate Manager ( AEDM ) David deals with applications for changes to the many Vehicle Testing Stations ( VTS’s) including managing the growth of the Number of MOT testing stations that Protyre operate, allocating MOT tester roles, and monitoring the MOT Test logs to ensure that Protyre MOT standards are maintained as the best in the industry. David handles the relationships with our parts suppliers to ensure that Protyre only fit the best quality servicing parts, brake parts, and other aftermarket quality parts at the right price. David is also involved in ensuring that all technicians are trained or assessed to carry out the work completed in all centres, and that Protyre has a robust Quality control ( QC) Procedure in all centres. David is also involved in developing the customer service standards and customer service training for all Protyre team members to ensure that all Protyre customers can expect the highest levels of customer service. At Protyre we believe we have the highest levels of customer service excellence that can be found, not only in the garage industry, but also when compared to other retail organisations. Another area of expertise is David’s involvement in developing Protyre Operational, Environmental, and safe working procedures. David has worked for some of the UK’s best retailers and this expertise has been a key component in helping develop Protyre into a highly respected company within the fast fit industry. David’s mission is ensuring that Protyre is the local garage that you can trust.