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Tire Wear Conditions
    Alternate Lug Wear
    Both Shoulder Wear
    Brake Skid
    Spotty Wear
    Cupping/Scalloping
    Diagonal Wear
    Erosion Wear
    Feather Edge Wear
    Heel/Toe Wear
    One-Sided Wear
    Rib Punch
    Shoulder Scrubbing
    Shoulder Step
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Spotty Wear
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Appearance

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Probable Causes
- mismounted tire/wheel assembly
- loose wheel bearings
- worn bearings, shocks, springs or
other suspension components
- mismatched duals
- inconsistent dual inflation
- out of balance wheel assembly
- brake lock due to malfunction or
unbalanced brake system
- aggressive brake application
- tire sitting in oil, fuel or chemicals
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