Kawasaki Z250SL Owner's Manual - page 125
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So it is false economy and unsafe to
use the tires until they are bald.
Tire Wear Inspection
•
Measure the depth of the tread with
a depth gauge, and replace any tire
that has worn down to the minimum
allowable tread depth.
A. Tire Depth Gauge
Minimum Tread Depth
Front
—
1 mm (0.04 in.)
Under 130 km/h
(80 mph)
2 mm (0.08 in.)
Rear
Over 130 km/h
(80 mph)
3 mm (0.12 in.)
•
Visually inspect the tire for cracks
and cuts, replacing the tire in case of
bad damage. Swelling or high spots
indicate internal damage, requiring
tire replacement.