Oh boy, tire talk, almost like and oil thread. I run big 19’s 8.5 up front and 10.5 rear. I run my fronts at about 28 and 34 cold on street, less on the track. I look primarily for tire wear patterns. This is a little trickier on the Boxster because the rear wheels have a relatively significant negative camber overall. I just look for even tire wear across the entire tire without sidewall scuffs. Most cars I run recommended pressures and leave then as they are. I’m always noodling with the P-Car pressures to get the most out of the tires, both grip and wear wise.
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