The determined vehicle speed is displayed in the instrument cluster and is important for controlling the driving safety systems and driving systems. The display accuracy of the speedometer and the odometer is legally prescribed. Determining the speed is dependent on the tyre size or the rolling circumference of the tyres. The rim diameter is always specified in inches.
For this reason, the vehicle control units can be coded for the following wheel size categories:
Wheel size category 1 |
|---|
195/65 R 16 C |
205/65 R 16 C |
225/60 R 16 C |
225/55 R 17 C |
225/55 R 17 XL |
245/45 R 18 XL |
Wheel size category 2 |
|---|
225/55 R 17 XL |
235/55 R 17 XL |
245/55 R 17 XL |
245/45 R 18 XL |
245/50 R 18 XL |
245/45 R 19 XL |
Mercedes-Benz recommends that you stay within a wheel size category when changing a tyre. In this way, you avoid recoding the control units.
Wheel size category 1
195/65 R16C
Wheel size category 2
225/55 R17XL
245/45 R18XL
If the wheel size category changes, you must have your vehicle's control units recoded at a qualified specialist workshop.