Probably the guys talking about high 30's to low 40's are talking about hot temps. Cold temps would be significantly lower, and are also less consistent to adjust by. You're better off making your adjustments right after you come off the track: check temps or chalk wear indicators, check pressure differentials, and even out the pressures while hot, dropping or adding a few PSI as necc to get the best use of the tire surface by temperature/chalk.
|