For 1990-2009 cars

#### Condition of tyres

If the minimum tread depth of the tyre is reached (wear indicator visible on the tyre) the customer must be informed and "Tyre wear indicator visible" written under "Observations" on the service plan checklist with VL / VR, HL / HR given in mm. In this case the actual remaining tread depth must be measured and documented (except for the spare wheel, for which the text "Tyre wear indicator visible" is sufficient).

Note: For safety reasons, tyres should be replaced when the tread depth is 2 to 3 mm. The legally permissible minimum tread depth (1.6 mm) is reached when the tread is worn down as far as a tread wear indicator. A number of wear indicators are evenly distributed in the tread base. Their locations are marked on the sidewall.

All vehicles leaving an GM factory are fitted with tread wear indicators. See the owner's manual for the use of snow chains.

Use the operational profile of the tyre to assess whether the tracking or axles need to be checked - and invoiced separately.

On tyres with a unidirectional tread, make sure that the direction markings are correctly observed. Only change tyres round on the same axles.