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I had my brand new winter tires set to 50 psi (35 max sidewall) all winter long. I just took them off and they still look brand new. Increased tire pressure will not wear tires unevenly, the steel belting inside them holds them so they do not ballon out like you would think. You'll actually get more miles out of the tires if you pump them up further. I also run my summer tires at 50 psi on the Matrix. However, they are rated at 51 max sidewall pressure. The factory recommendation is simply to give a nice soft ride.
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