Inspection
WARNING
Replace tire immediately with a Harley-Davidson specified tire when wear bars become visible or only 1 mm (1/32 in) tread depth remains. Riding with a worn tire could result in death or serious injury. (00090c)
Indicators on the tire sidewalls point to tread wear bars in the tread.
See Figure 3. Tread wear indicator bars appear in the tread pattern when 0.8 mm (1/32 in) or less of tread remains. Always replace the tires before the indicator bars appear.
Replace Tires
Replace worn tires with new tires if any of the following conditions exist:
  1. Tread wear indicator bars appear in the tread pattern.
  2. Tire cords or fabric are visible through cracked sidewalls, snags or deep cuts.
  3. A bump, bulge or split is found anywhere on the tire.
  4. The tire is damaged by a puncture, cut or other damage that cannot be repaired.
Figure 1. Tread Wear Indicator: Michelin Tires
Figure 2. Tread Wear Indicator: Dunlop Tires
Figure 3. Wear Bar Location (typical)