How does tired tread get “worn” and why do they often wear unevenly, thus the need for rotation?
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Your car has adjustments for the suspension, and if it has independent rear suspension, your rear suspension is also adjustable. Ideally, you want your tires to wear evenly. Depending on your car and it’s factory alignment, you likely have a lot of caster on the front tires. That adjustment is how much camber your tire has while turning. That wears out the edges of the front tires faster than the middle.
The rear of the car often carries less weight than the front and the tires aren’t loaded as much. This allows the middle of the tire to wear faster than the edges. This also allows you to do peg leg burn outs on a rwd.
Numerous studies have been done and it helps increase tire life compared to not rotating them.
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