2-30 PERIODIC MAINTENANCE
Wheel/Tire Damage Inspection
Visually inspect the tire for cracks [A] and cuts [B], and re-
place the tire if necessary. Swelling or high spots indicate
internal damage, requiring tire replacement.
Remove any imbedded stones [C], nail [D] or other foreign
particles from the tread.
Wear Indicator Position Mark [E]
Visually inspect the wheel for cracks, cuts and dents dam-
If any damage is found, replace the wheel if necessary.
Tire Tread Wear Inspection
As the tire tread wears down, the tire becomes more sus-
ceptible to puncture and failure. An accepted estimate is
that 90% of all tire failures occur during the last 10% of tread
life (90% worn). So it is false economy and unsafe to use
the tires until they are bald.
Measure the tread depth at the center of the tread with a
depth gauge [A]. Since the tire may wear unevenly, take
measurement at several places.
Wear Indicator [A]
Wear Indicator Position Mark [B]
If any measurement is less than the service limit, replace
the tire (see Tire Removal/Installation in the Wheels/Tires
3.6 mm (0.14 in.)
5.8 mm (0.23 in.)
1 mm (0.04 in.)
(AT, CH, DE) 1.6 mm (0.06 in.)
2 mm (0.08 in.) (Up to 130 km/h)
3 mm (0.12 in.) (Over 130 km/h)