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MICHELIN AMERICAS TRUCK TIRES
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IRREGULAR TIRE WEAR 101

Select your axle and tire wear area to help diagnose the cause and effect of your irregular tire wear issue, and to find out the best solutions.

On which axle is the irregular tire wear occurring?

PLEASE SELECT:
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Choose the irregular wear area on your tire.

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RESULTS

ONE SIDED WEARWear increasing from one side to the other.

SHOULDER STEP WEARPartial or full depression of the inside or outside shoulder tread rib.

EROSION / RIVER WEARCircumferential worn area situated on the sides of the tread ribs.

DEPRESSION WEAR (INTERMEDIATE)One or more interior ribs (not center) depressed more than adjacent ribs.

DIAGONAL WEARManifests in the form of oblique wear patches. Can appear singularly or repeat around the circumference of the tire.

MULTIPLE FLAT SPOTTING WEARMultiple radially worn areas around the tire.

FEATHERINGFeathering at the edge of the tread ribs.

DEPRESSION WEAR (SHOULDER)Localized wear patch on the shoulder rib of the tire. This patch can repeat around the circumference of the tire.

DEPRESSION WEAR (CENTER)Circumferential depression wear of the center tread rib.

MULTIPLE CUTS / CHUNKINGNumerous small cuts to the tread surface with portions of tread removed, giving a rough appearance.

VEHICLE / SPIN DAMAGECuts or lines 360 degrees around the tire.

BRAKE SKID DAMAGELocalized spot of excessive wear across tread face showing abrasion marks. Damage may extend into casing.

STONE RETENTION / DRILLINGStones or gravel embedded between tread blocks, sometimes reaching steel cables.

HEEL / TOE WEAREach lug around tire worn high to low from front to back edge.

CUPPING / SCALLOP / ALTERNATE LUG WEARLocalized cupped-out areas of fast wear around the tire. Alternate lugs worn to different tread depths around the tire.

DEPRESSION WEAR (INTERMEDIATE)One or more interior ribs (not center) worn below adjacent ribs around the tire's circumference.

DIAGONAL WEARLocalized flat spots worn diagonally across the tread, often repeating around the tire.

BRAKE SKID DAMAGELocalized spot of excessive wear across tread face showing abrasion marks. Damage may extend into casing.

DEPRESSION WEAR (SHOULDER)Localized areas of wear in shoulder, generally less than 12" in length.

SHOULDER STEP WEARTire worn on edge of one shoulder, greater than 12" in circumference.

CUPPING / SCALLOP WEARRandom areas of fast wear around the tire. Erratic in some instances.

ONE-SIDED WEAR

One Sided Wear

APPEARANCE

Wear increasing from one side to the other.

PROBABLE CAUSE

Out of alignment specification parameters (camber, toe, axle parallelism).

CORRECTIVE ACTION

Check alignment and inspect for worn parts.

TIRE DISPOSITION

Continue to run until minimum tread depth is reached.

SHOULDER STEP WEAR

Shoulder Step Wear Steer

APPEARANCE

Partial or full depression of the inside or outside shoulder tread rib.

PROBABLE CAUSE

This condition is common on radial tires in slow-wearing operations.

CORRECTIVE ACTION

None

TIRE DISPOSITION

Continue to run or rotate.

EROSION / RIVER WEAR

Erosion River Wear

APPEARANCE

Circumferential worn area situated on the sides of the tread ribs.

PROBABLE CAUSE

Condition most commonly occurs on slow-wearing radial tires in steer or trailer position (free rolling).

CORRECTIVE ACTION

None

TIRE DISPOSITION

Continue to run.

DEPRESSION WEAR (INTERMEDIATE)

Depression Wear Steer

APPEARANCE

One or more interior ribs (not center) depressed more than adjacent ribs.

PROBABLE CAUSE

Incorrect air pressure, worn mechanical part, or nonuniformity such as mismount.

CORRECTIVE ACTION

Check air pressure and mechanical issues.

TIRE DISPOSITION

Rotate or retread.

DIAGONAL WEAR

Diagonal Wear Steer

APPEARANCE

Manifests in the form of oblique wear patches. Can appear singularly or repeat around the circumference of the tire.

PROBABLE CAUSE

Misalignment, radial and lateral runout, severely out of balance, loose wheel bearings or steering parts.

CORRECTIVE ACTION

Check for mismount and worn parts.

TIRE DISPOSITION

Reverse direction of tire or retread.

Multiple Flat Spotting Wear

Multiple Flat Spotting Wear

APPEARANCE

Multiple radially worn areas around the tire.

PROBABLE CAUSE

Faulty shocks, loose/worn wheel bearings, severe balance issues, mismatched pressures or tire diameters, excessive high-speed empty operation.

CORRECTIVE ACTION

Check for mechanical issue; check air pressure.

TIRE DISPOSITION

Continue to run or retread.

Feathering

Radial Feather Wear

APPEARANCE

Feathering at the edge of the tread ribs.

PROBABLE CAUSE

Usually the result of continued exposure to lateral force, such as excessive toe. Can also form as a result of counter-steering to compensate for drive axle misalignment.

CORRECTIVE ACTION

Check alignment

TIRE DISPOSITION

Rotate to another position or retread.

Depression Wear (Shoulder)

Depression Wear Steer Shoulder

APPEARANCE

Localized wear patch on the shoulder rib of the tire. This patch can repeat around the circumference of the tire.

PROBABLE CAUSE

Faulty shocks, lateral runout, loose wheel bearings, mismount, severe balance issue.

CORRECTIVE ACTION

Check for mechanical problem.

TIRE DISPOSITION

Continue to run, rotate or retread.

Depression Wear (Center)

Depression Wear Steer Center

APPEARANCE

Circumferential depression wear of the center tread rib.

PROBABLE CAUSE

Overloaded/underinflated, faulty shocks, loose wheel bearings, mismount, high-speed empty haul conditions.

CORRECTIVE ACTION

Check air pressures/load weight and worn parts.

TIRE DISPOSITION

Continue to run, rotate or retread.

Multiple Cuts / Chunking

Multiple Cuts Chunking

APPEARANCE

Numerous small cuts to the tread surface with portions of tread removed, giving a rough appearance.

PROBABLE CAUSE

Vehicle operation on rough surfaces (misapplication of tread compound).

CORRECTIVE ACTION

Review tire selection and operation.

TIRE DISPOSITION

Minor damage; should return to service. Consult retreader for possible repair and retread.

Vehicle / Spin Damage

Vehicle Spin Damage

APPEARANCE

Cuts or lines 360 degrees around the tire.

PROBABLE CAUSE

Contact with vehicle components (mud flap brackets, bumpers), or spinning the tires on ice or loose road surface

CORRECTIVE ACTION

Analyze cause. Ensure tire does not contact vehicle components. Review driver practices.

TIRE DISPOSITION

Return to service if damage is not below base of tread groove. If deeper, retread or scrap.

Brake Skid Damage

Brake Skid Damage Drive

APPEARANCE

Localized spot of excessive wear across tread face showing abrasion marks. Damage may extend into casing.

PROBABLE CAUSE

New brakes (not worn in), unbalanced brake system, frozen brake lines, driver abuse.

CORRECTIVE ACTION

Check brake system.

TIRE DISPOSITION

May be repaired or retreaded if casing is undamaged; otherwise, scrap.

Stone Retention / Drilling

Stone Retention Drilling

APPEARANCE

Stones or gravel embedded between tread blocks, sometimes reaching steel cables.

PROBABLE CAUSE

Condition is common with vehicles operating on gravel surfaces. Overinflation, misapplication of the tire.

CORRECTIVE ACTION

Remove stones & return to service. Maintain proper inflation pressures.

TIRE DISPOSITION

Continue to run unless there are multiple spots reaching steel cables. Consult retreader or tire manufacturer.

Heel / Toe Wear

Heel Toe Wear

APPEARANCE

Each lug around tire worn high to low from front to back edge.

PROBABLE CAUSE

Mismatched inflation pressure or tire diameters in a dual assembly. High torque conditions, mountainous terrains, and high inflation pressures aggravate this condition.

CORRECTIVE ACTION

Review tire maintenance practices. Consult tire manufacturer when selecting tire for operation.

TIRE DISPOSITION

Continue to run. If severe, change direction of rotation.

Cupping / Scallop / Alternate Lug Wear

Cupping Scallop Alternate Lug Wear

APPEARANCE

Localized cupped-out areas of fast wear around the tire. Alternate lugs worn to different tread depths around the tire.

PROBABLE CAUSE

Mismatched inflation pressure or tire diameters in a dual assembly. Aggravated by slow rate of wear, poorly maintained suspension components.

CORRECTIVE ACTION

Check for mechanical problem.

TIRE DISPOSITION

Check for worn components, inflation pressures and matching tread depths.

Depression Wear (Intermediate)

Depression Wear Intermediate

APPEARANCE

One or more interior ribs (not center) worn below adjacent ribs around the tire's circumference.

PROBABLE CAUSE

Worn suspension components, mismatched dual diameter or inflation pressures, underinflation, improper bearing adjustment. Aggravated by high speed/light loads.

CORRECTIVE ACTION

Diagnose mechanical condition and correct.

TIRE DISPOSITION

Continue to run until pull point, then retread.

Diagonal Wear

Diagonal Wear Trailer

APPEARANCE

Localized flat spots worn diagonally across the tread, often repeating around the tire.

PROBABLE CAUSE

Improper bearing adjustment, misalignment, mismatched dual tire diameter and/or inflation pressure. May start as brake skid. Aggravated by high speed/light loads.

CORRECTIVE ACTION

Analyze cause and correct.

TIRE DISPOSITION

Reverse direction of rotation. If excessive, submit for retreading.

Brake Skid Damage

Brake Skid Damage Trailer

APPEARANCE

Localized spot of excessive wear across tread face showing abrasion marks. Damage may extend into casing.

PROBABLE CAUSE

New brakes (not worn in), unbalanced brake system, frozen brake lines, driver abuse.

CORRECTIVE ACTION

Check brake system.

TIRE DISPOSITION

May be repaired or retreaded if casing is undamaged; otherwise, scrap.

Depression Wear (Shoulder)

Depression Wear Shoulder

APPEARANCE

Localized areas of wear in shoulder, generally less than 12" in length.

PROBABLE CAUSE

Improper inflation pressure or tire mismounted on wheel. Can also be caused by some other type of wheel end imbalance.

CORRECTIVE ACTION

Review tire and wheel end maintenance practices.

TIRE DISPOSITION

Continue to run until pull point, then retread.

Shoulder Step Wear

Shoulder Step Wear Trailer

APPEARANCE

Tire worn on edge of one shoulder, greater than 12" in circumference.

PROBABLE CAUSE

Excessive camber, misaligned or damaged axle, improper bearing adjustment.

CORRECTIVE ACTION

Diagnose misalignment and/or mechanical condition and correct.

TIRE DISPOSITION

Reverse direction of rotation. If excessive, submit for retreading.

Cupping / Scallop Wear

Cupping Scallop Wear

APPEARANCE

Random areas of fast wear around the tire. Erratic in some instances.

PROBABLE CAUSE

Mismatched inflation pressure or tire diameters in a dual assembly. Aggravated by high speeds/light loads, poorly maintained suspension components.

CORRECTIVE ACTION

Check for worn components, inflation pressures and matching tread depths.

TIRE DISPOSITION

Continue to run until pull point, then retread.

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