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I tracked my X1 s28i M Sport with summer performance Pirelli P7's grippy rubber.
I used a laser temp gun to make sure I wasn't running over the sidewalls.
This car has very close to 50/50 weight ratio because of base engine, etc., but when I put 40psi hot in front and 40 psi hot in back it felt like it didn't want to turn very easy.
When I put 42 rear, it would rotate just right because I was getting less traction rear.
My rears are wearing slightly more in the middle, and faster than the front.
I need to lower psi in the rears to get perfect wear, and I'd not put more than 3 psi more in rear cold (35 front cold 38rear cold max).
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