How does tired tread get “worn” and why do they often wear unevenly, thus the need for rotation?
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You see, their are Tire Fairies and they are a fickle bunch of fae when it comes to tires. No worries though, put a flat under your pillow when you go to sleep and you’ll get a substantial windfall in the morning.
Rubber is softer than concrete. When you constantly have a ton or more of weight on the rubber which is on the concrete, and then apply force to the rubber to spin the tires and make the car move, after enough time the friction wears the rubber down.
The wear unevenly because our roads aren’t perfectly flat and when you run something over, like dummy bumps or rocks, they don’t wear the whole tire, just the points of impact.
Tire wear is caused by friction with the road rubbing rubber off the tires as you drive. Tires wear unevenly because the drive wheels will wear more quickly than the non drive wheels
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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