The key reason for rotating your tyres is to make sure that the tread on all of them wears down at the same rate. Different tyres lose tread depth more quickly depending on where they are on a vehicle. Even on AWD vehicles, the front wheels will most likely lose tyre tread depth more quickly than the back wheels, because the front wheels undergo a disproportionate amount of the force of steering, braking and acceleration (in most drive train configurations). Front tyres can also wear out more quickly due to wheel alignment problems. The root cause of misalignment should be addressed separately, but a tyre rotation can mitigate the severity of the problem. Additionally, any wheel that gets more power delivered to it than another (whether the rear tyres on a RWD or the front tyres on FWD) will suffer more torque and wear differently. If one or more tyres wears out more quickly than others, the day when you have to shell out the cash to buy an entire new set of tyres will arrive more qu ...
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