Polaris 2003 Victory Classic Cruiser - Manual (Page 131)

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MAINTENANCE
Tires
Check Tire Condition
Inspect the tire sidewalls, road contact surface, and tread base for cuts, punctures, and cracking. Replace damaged
tires immediately (see your Victory Service Manual or an authorized Victory dealer).
Check Tread Depth
Raised areas at the base of the tread, known as wear bars; act as easily
visible tread depth indicators. When the road contact surface has worn
to the top of the wear bars, replace the tire.
For more precise measurement, use a depth gauge or an accurate ruler
to measure the depth of the center tire tread. Replace the tire if the
tread depth is less than 1/16 inch (1.6 mm).
1. Tread Depth Gauge
1