2-38 PERIODIC MAINTENANCE
Periodic Maintenance Procedures
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.
If any measurement is less than the service limit, replace
the tire (see Tire Removal/Installation in the Wheels/Tires
4.4 mm (0.17 in.)
6.7 mm (0.26 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 (80 mph))
3 mm (0.12 in.) (Over 130 km/h (80 mph))
Some replacement tires may adversely affect han-
dling and cause an accident resulting in serious in-
jury or death. To ensure proper handling and sta-
bility, use only the recommended standard tires for
replacement, inflated to the standard pressure.
Most countries may have their own regulations a mini-
mum tire tread depth: be sure to follow them.
Check and balance the wheel when a tire is replaced
with a new one.
Wheel Bearing Damage Inspection
Raise the front wheel off the ground with the jack (see
Front Wheel Removal in the Wheels/Tires chapter).
Special Tools - Jack: 57001-1238
Attachment Jack: 57001-1252
Jack Attachment: 57001-1608
Turn the handlebars all the way to the right or left.
Inspect the roughness of the front wheel bearing by push-
ing and pulling [A] the wheel.
Spin [B] the front wheel lightly, and check for smoothly
turn, roughness, binding or noise.
If roughness, binding or noise is found, remove the front
wheel and inspect the wheel bearing (see Front Wheel
Removal, Hub Bearing Inspection in the Wheels/Tires