The steer axle plays a huge role in a truck’s stability and handling. But it's also the most sensitive position for tyre wear. Let’s take a closer look at six common wear patterns and what they’re telling you:
1.One-Sided Wear
Look: Tread wear increases from one side to the other.
Cause: Misalignment (camber, toe, axle parallelism).
Fix: Check alignment and inspect worn parts.
Tyre Handling: Continue to run until minimum tread depth is reached.
2.Shoulder Step Wear
Look: Depression on the inside or outside shoulder tread rib.
Cause: Common in radial tyres under slow wear conditions.
Fix: None needed.
Tyre Handling: Continue running or rotate if needed.
3.Erosion / River Wear
Look: Circumferential worn areas along the sides of the ribs.
Cause: Happens on slow-wearing radial tyres in free-rolling positions (steer/trailer).
Fix: None needed.
Tyre Handling: Continue running.
4.Depression Wear (Intermediate)
Look: Interior ribs (not center) appear more depressed than others.
Cause: Incorrect air pressure, mechanical wear, or mismount.
Fix: Check air pressure and mechanical systems.
Tyre Handling: Rotate or retread.
5.Diagonal Wear
Look: Oblique wear patches around the tyre.
Cause: Misalignment, runout, imbalance, or worn steering parts.
Fix: Inspect for runout and worn components.
Tyre Handling: Reverse tyre direction or retread.
6.Radial Feather Wear
Look: Feathered tread edges.
Cause: Excessive toe or compensation for drive axle misalignment.
Fix: Realign the vehicle.
Tyre Handling: Rotate to another position or retread.
7.Multiple Flat Spotting Wear
Appearance: Multiple radially worn patches around the tyre.
Cause: Faulty shocks, loose or worn wheel bearings, severe balance issues, mismatched tyre pressures or diameters, high-speed empty driving.
Fix: Inspect and repair shocks, bearings, balance, and air pressures.
Tyre Handling: Continue to run or retread.
8.Depression Wear (Shoulder)
Appearance: Localized wear patches on the shoulder rib, possibly repeating around the tyre.
Cause: Faulty shocks, lateral runout, loose wheel bearings, mis-mount, or severe balance issues.
Fix: Check for mechanical issues and correct them.
Tyre Handling: Continue running, rotate, or retread.
9.Depression Wear (Center)
Appearance: Circumferential depression in the center tread rib.
Cause: Overloading, underinflation, faulty shocks, loose wheel bearings, mis-mounting, or frequent high-speed empty runs.
Fix: Adjust air pressures, check load weights, and repair worn mechanical parts.
Tyre Handling: Continue to run, rotate, or retread.
Tip: Early detection of irregular wear saves you money on tyres and keeps your fleet safer on the road.
