| The speed rating (e.g. „T“) following the size of the tyre (e.g. 185/65 R 14 86T)) indicates the maximum permitted speed (vmax) of the tyre. |
| The tyres for the vehicle must be selected so that their maximum permitted speed is greater than the maximum speed that the vehicle („based on model“) can attain. |
| Vehicles with national type approval |
| If the vehicle has a national type approval, the maximum speed for the vehicle is calculated as follows: |
| Formula for vehicles with vmax up to 150 km/h |
| Example: Specified maximum speed v = 145 km/h |
|
| vmax = 1.03 x 145 km/h + 3.5 km/h = 152.85 km/h |
| In this example, a tyre with the speed rating „Q“ or higher must be used. |
| Formula for vehicles with vmax above 151 km/h |
| Example: Specified maximum speed v = 163 km/h |
|
| vmax = 1.01 x 163 km/h + 6.5 km/h = 171.13 km/h |
| In this example, a tyre with the speed rating „S“ or higher must be used. |
| Vehicles with EC type approval |
| If your vehicle has an EC type approval, the maximum speed for all vehicles is calculated as follows: |
| Example: Specified maximum speed v = 172 km/h |
|
| vmax = 1.05 x 172 km/h 180.60 km/h |
| In this example, a tyre with the speed rating „T“ or higher must be used. |
| It is permitted to use tyres with a higher speed rating. The same applies to tyres with a higher load index. |
Note |
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