Second only to fuel among running costs, tyres also happen to be a free diagnostic tool: almost every chassis and pressure problem records itself in the tread. Reading wear patterns turns a tyre check into a health check for the whole axle.
The patterns and what they mean
- Centre wear: over-inflation — the crown carries everything.
- Both shoulders worn: under-inflation — the tyre folds and the shoulders scrub. Also the signature of chronic overloading.
- One shoulder only: axle alignment or camber problems; on trailers, often a bent or misaligned axle after a kerb strike.
- Feathered edges you can feel by hand: toe misalignment — the tyre is being dragged slightly sideways every metre.
- Cupping or scalloped dips: worn shock absorbers, loose wheel bearings or imbalance letting the wheel hop.
- Flat spots: brake lock-ups — check the axle’s brake balance, not just the tyre.
- Diagonal wear bands: usually worn suspension bushings or mismatched dual pressures.
Duals: the silent money leak
Twinned tyres must match in pressure and rolling circumference. A few millimetres of diameter difference forces the pair to fight each other constantly — heat, drag and rapid wear on the smaller tyre. Match duals by tread depth, and gauge both; the inner tyre is exactly as important as it is annoying to reach.
Pressure is a weekly discipline
Pressure does more for tyre life, fuel and safety than any other single factor — under-inflation wastes fuel and cooks casings. Gauge cold, weekly, every position including the trailer. The overlap with fuel economy is direct: see our guide to cutting fuel consumption.
Depth, law and judgment
Legal minimums vary by market — but professional operators change tyres before the law requires it, because wet grip decays long before the tread gauge says illegal. Managed casings also feed a healthy retread programme: quality retreads on managed casings are standard practice in serious fleets, not a compromise.
General information for professional operators. Follow tyre manufacturer load/pressure tables and local regulations.
Cover photo: Matty Ring via Wikimedia Commons, CC BY 2.0
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