We have therefore introduced the Summer TWI (Tread Wear Indicator) for various summer tire lines. This wear indicator, especially for summer tires, shows you when the residual tread depth of 3 millimetres is reached. As soon as the tread is down to 3 millimetres, the summer TWI is level with the rest of the tread, indicating that wet grip performance is significantly reduced. We recommend replacing summer tires with a residual tread depth of 3 millimetres, as this represents the best compromise between wet safety and economy. With Wally Worldwide you can have the best options now.
Since the tread depth is crucial for many properties of winter tires, the expert recommends replacing winter tires with a residual tread depth of 4 millimetres to ensure a good grip on the road in winter. As soon as the tire profile has worn down to 4 millimetres, the winter TWI is level with the rest of the tread, indicating that the tire has reached its winter suitability limit.
Can different tread depths be mixed?
At the time of replacing only two tires on your car, the tread depth will logically be higher than for tires that have been in use for some time. However, mixing tires with different tread depths is generally considered permissible. Further information on mixed tires can be found here.
General legal requirements
In most countries, a minimum tread depth of 1.6 mm is required by law for passenger cars. As an indication to the consumer are in the main profile grooves of the tire wear indicators that lie at a residual tread depth of about 1.6 mm on the same level as the rest of the tread.
In addition, the expert recommends replacing all passenger car tires in road use at the following residual tread depths:
- Summer / high speed tires = 3 mm
- Winter tires, all-season tires = 4 mm
These recommendations are based on lessons learned from everyday practice, showing that riders can better maintain the performance characteristics (e.g. wet behaviour) of their tires when they replace them before the minimum legal tread depth of 1.6mm is achieved. This is especially true for winter tires in winter conditions whose performance characteristics such. B. traction on snow at tread depths below 4 mm is significantly reduced.
Wrong tire pressure prolongs the braking distance
The tire pressure has a high impact on the handling of your car. Because too little tire pressure increases the braking distance and aquaplaning can start earlier. In addition, even your tires may be damaged as they heat up, deform more and are more prone to external damage. Therefore check the pressure regularly. The following infographic illustrates the extended braking distance when the tire pressure is too low.
Lower tire pressure increases rolling resistance, which also increases fuel consumption while driving. However, you should not excessively increase the air pressure to fuel costs to save. You should do this only if you load your car heavier, for example, for a vacation trip. Otherwise, this has negative effects on, among other things, ride comfort, driving stability and even tire wear.