Quote:
Originally Posted by roosterk0031
Too many varibles, old bald smooth tires are roll easier than new tires.
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Old tires had 3,000mi, brand new.
Quote:
Originally Posted by ksa8907
Double check your brakes for drag
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Brand new car brakes are fine
Quote:
Originally Posted by Hersbird
I bet they were 40 psi cold and then the PO measured 49 psi after driving. The 40 psi cold is correct and measuring the tires after driving is a worthless/meaningless number. So many people make the mistake of measuring pressure some other time then first thing in the morning before even the sun has a chance to heat up the black sidewalls and before driving the car which also heat them up and raises the pressure.
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They were measured early in the morning, and the difference btw tires on sunny and shady side was less then .5psi; below gauge accuracy.
Quote:
Originally Posted by CapriRacer
Actually, you did the right thing. Tires grow a lot in the first 24 hours. Our test garage used to over inflate new tires by 2 to 3 psi, which came out really close a couple of days later.
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On m/c tires I used to pump them to 60psi while sitting in garage (operating pressure 42psi for rear) then drop pressure to 28psi and go for short 1/2hr sub-50mph ride. It would take several cycles to completely break in tires this way.
M/C racing tires are said to grow so much that by the end of the race people would need different gear ratio. So the trick was to get it on lower side so it would be more or less ideal in the middle of the race.