Abnormal wear is where the inside or outside edge or shoulder of the tyre shows extreme wear, but the rest of the tread shows little wear. This is called camber wear and results from the tyre leaning in or out (it should be straight up and down when rolling down the road). Camber wear can be caused by suspension misalignment, a bent strut, a dislocated strut tower (often the result of unrepaired collision damage), a weak or broken spring, a bent spindle, or collapsed or damaged control arm bushings.
Abnormal tyre wear results from a suspension or alignment problem, an internal tyre fault, or the result of driving on underinflated or overinflated tyres.
The suspension should be inspected for worn or damaged parts, and an alignment check performed to determine what needs to be fixed to correct the problem.
If the tread develops a feathered or directional wear pattern - where the tread feels smooth when you run your hand across it one way but feels rough when you rub it in the opposite direction - you have a toe wear problem. Toe refers to the parallel gap between the wheels as they roll down the road. If the wheels are toed in or out with respect to one another, the tread will scuff and develop a feathered wear pattern. This may be due to toe misalignment, worn tie rod ends, worn idler arms, bent steering linkage or bent steering arms. As with camber wear, the suspension should be inspected and the alignment checked to determine what's causing the problem.
A cupped wear pattern on the tyres can be caused by either a tyre that is out of balance or by weak shock absorbers or struts. This type of wear occurs because the wheel bounces up and down as it rolls down the road. The cure here is to have the wheel balanced or replace the worn shocks or struts.
If the centre of the tread is worn more than the shoulders, it may be the result of over-inflation. It might be the case that you're putting too much air in your tyres, causing them to bulge out in the centre and, thus, wear unevenly. It might be a good idea to refer to the recommended inflation pressures in your owner's manual.
Finally, if the shoulders of a tyre are worn more than the centre, it may mean that the tyre doesn't have enough air in it. Under-inflation shifts the weight carried by the tyre to the edges of the tread causing the shoulders to wear more than the centre. As with over-inflation, refer to the recommended inflation pressure for your vehicle.
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