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Depending on tire construction, setting pressure based on what the chalk tells you may have the tire at far to low of a pressure.
Let's go back in time when BFG R1 tires wanted 18 psi and Hoosier autocross tires wanted 44 psi (mid '90's). Neither tire could be setup using the chalk method. The Hoosier would have been filled with too little air and the BFG with too much. Consider cars with improper camber settings and the situation gets worse.
I haven't looked at autocross tires lately, but I bet the really fast guys don't use chalk. I know we don't for road racing. That's why I suggested finding someone fast using the same tires. They will know what pressures work for both speed and wear.
Scott
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