Punch Wear

One or more inner ribs worn below the level of the adjacent ribs circumferentally around the tire.

Lack of shock absorber control in some suspension types, mismatched tire sizes and/or inflation pressures between duals, loose or worn wheel bearings, assembly non-uniformity such as improper bead seating and out-of-balance condition, 
aggravated by high speed empty hauls.

If not worn excessively, continue to run. If wear is excessive, retread.
Diagnose mechanical problem and correct.

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