The optimal temperature on a tire will vary based on the tire compound you are running. R comps will run at a much higher temp than any street tire. The general rule of thumb is a 10-20F warmer on the inside than any other. Of course this means you have to have camber adjustment. Also temperature should be taken after car comes off the track without a cool down lap. Lastly, never bleed your tires when it is hot as they will drop right back down as soon as the tires cool down.
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