Irregular Steer Tire Wear Patterns

THE USUAL SUSPECTS Irregular Steer Tire Wear Patterns

One Sided Wear Shoulder Step Wear Erosion/River Wear Wear increasing from one side Circumferential worn area Appearance Partial or full depression of to the other. Appearance the inside or outside shoulder Appearance situated on the sides of the tread rib. tread ribs. Out of alignment specification Probable Cause parameters (camber, toe, axle This condition is common on Condition most commonly Probable parallelism). Cause radial tires in slow wearing Probable occurs on slow wearing radial operations. Cause tires in steer or trailer position Corrective Check alignment and inspect (free rolling). Action for worn parts. Corrective None Action Corrective None Continue to run until Action Tire minimum tread depth is Disposition Tire Continue to run or rotate. Tire reached. Disposition Disposition Continue to run.

Depression Wear Diagonal Wear Radial Feather Wear (Intermediate) Manifests in the form of Feathering at the edge of the Appearance One or more interior ribs (not oblique wear patches. Can tread ribs. Appearance Appearance appear singularly or repeat center) depressed more than around the circumference of Usually the result of continued adjacent ribs. the tire. exposure to lateral force, such Probable as excessive toe. Can also form Incorrect air pressure, worn Misalignment, radial and Cause as a result of counter-steering Probable mechanical part, or non- Probable lateral runout, severe out of Cause Cause to compensate for drive axle uniformity such as mismount. balance, loose wheel bearings misalignment. or steering parts. Check air pressure and Corrective Corrective Corrective Action Check for mismount and worn Check alignment. mechanical issues. Action parts. Action Tire Rotate to another position or Rotate or retread. Tire Reverse direction of tire or Tire Disposition Disposition retread. Disposition retread. Multiple Flat Spotting Wear Depression Wear Depression Wear (Shoulder) (Center) Multiple radially worn areas Appearance around the tire. Localized wear patch on the Circumferential depression shoulder rib of the tire. This Appearance Appearance wear of the center tread rib. Faulty shocks, loose/worn patch can repeat around the wheel bearings, severe balance circumference of the tire. Overloaded/underinflated, Probable Cause issues, mismatched pressures Faulty shocks, lateral runout, Probable faulty shocks, loose wheel Cause or tire diameters, excessive Probable loose wheel bearings, bearings, mismount, high high speed empty operation. Cause mis-mount, severe balance speed empty haul conditions. issue. Corrective Check for mechanical issue, Corrective Check air pressures/load Action Corrective Action check air pressure. Action Check for mechanical problem. weight and worn parts. Continue to run, rotate or Tire Continue to run or retread. Tire Continue to run, rotate or Tire Disposition Disposition retread. Disposition retread.

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MWT43963 (02/14)