i run 29/36 as per porsche on the street. i take that pressure to the track and, when the tires get hot, they swell to 34/40. at 34/40 the fronts are starting to roll onto the sidewall and the rears are only running on their middles, so after a few laps to heat the tires i modify to 36/38 and the car drives like it is on rails and the tires wear evenly.
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