Quote:
Originally Posted by churchx
I do know that wider tires have higher volume and to carry/support same load/car mass need less pressure vs narrower ones. But what is formula given new and old tire sizes and pressure for old, to calculate supposed pressure for new wider tires?
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As low as you can run them without the sidewall rolling over and still getting them to ideal temperature, thats the formula. You need a sensible butt dyno to feel the tire rolling over and a pyrometer to measure temp. For autocross you may need higher pressures just because the runs are so short you wont get them up to temp fast. On the track, temperature is rarely a problem (its usually the oposite, you have too much temp).