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I have the sport model and I am not sure how many miles these things are rated for. I have been driving with 40psi at about 11K and I have increased it to 45psi then 50psi up until my mileage now which is at 31k. Tonight I just pumped the tires up to 55psi and the ride is not much different than the 50psi and the tire does not look any different, though I have driven only ~10miles on the tires at 55psi. I must say I have had my tires rotated and balanced at least every 5k.
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