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I just got some pirreli pzero 275/40/19 run flats for the rear wheels on my car and i cant find anywhere a good psi to put in them it just says max is 51psi and the tire shop put 45psi in them but that seems crazy high to me. I was thinking of just putting them down to around 30-35psi but idk if run flats are supposed to be at a higher psi or what so im hoping some of you guys will know this answer.