Tread ribs worn so that one side of rib is higher than the other resulting in step-offs across the tread face. Generally, all ribs exhibit this wear.
Excessive side force scrubbing, resulting from severe conditions of misalignment such as excessive toe, severe drive axle misalignment, worn, missing or damaged suspension components, bent tie rod or other chassis misalignment.
If feather wear is severe, tires can be rotated to another axle for maximum utilization of remaining tread.
Diagnose and correct misalignment condition as required. If feather wear on both steer tires is in the same direction, drive axle or other chassis misalignment is indicated. If steer tire feathers are in opposite directions, a toe condition is indicated.