Tires, Speed Ratings
The speed rating (for example "T") behind the tire size specification (for example 185/65 R 14 86T) indicates the maximum permissible speed (vmax ) for the tire.
When selecting the tires for a vehicle, ensure that their maximal permissible speed lies above the maximum speed attainable by the vehicle ("design-related").
Formula for Vehicles with Speed Rating "v" from 151 km/h (94 mph)
vmax = 1.01 x v + 6.5 km/h (4.04 mph)
Example: Indicated maximum speed v = 163 km/h (101.28 mph)
vmax = 1.01 x 163 km/h + 6.5 km/h = 171.13 km/h (1.01 x 101.28 mph + 4.04 mph = 106.34 mph)
In this example, a "S" -tire or a tire with a higher-order speed rating must be used.
For the letter "v", enter the specified maximum speed in the vehicle registration Part I or II in the field "T" or in the vehicle title under number 6. This conversion is necessary, because due to technical reasons, all vehicles reach different maxim speeds within a legally permissible range.