Vehicle care 173Changing tyre and wheelsizeIf tyres of a different size than thosefitted at the factory are used, it may benecessary to reprogramme thespeedometer as well as the nominaltyre pressure and make other vehiclemodifications.After converting to a different tyresize, have the label with tyrepressures replaced.9 WarningUse of unsuitable tyres or wheelsmay lead to accidents and willinvalidate the vehicle typeapproval.Wheel coversWheel covers and tyres that arefactory approved for the respectivevehicle and comply with all of therelevant wheel and tyre combinationrequirements must be used.If the wheel covers and tyres used arenot factory approved, the tyres mustnot have a rim protection ridge.Wheel covers must not impair brakecooling.9 WarningUse of unsuitable tyres or wheelcovers could lead to suddenpressure loss and therebyaccidents.Tyre chainsTyre chains are only permitted on thefront wheels.Always use fine mesh chains that addno more than 10 mm to the tyre treadand the inboard sides (including chainlock).9 WarningDamage may lead to tyre blowout.Tyre chains are only permitted ontyres of size 175/70 R 14,185/60 R 15, 185/65 R 15 and 195/55R 16.Tyre chains are not permitted on tyresof size 215/45 R 17 and 225/35 R 18.The use of tyre chains is not permittedon the temporary spare wheel.Tyre repair kitMinor damage to the tyre tread can berepaired with the tyre repair kit.Do not remove foreign bodies fromthe tyres.
