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Old 01-23-2010, 04:31 PM   #1 (permalink)
orange4boy
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Join Date: Aug 2008
Location: The Wet Coast, Kanuckistan.
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The Golden Egg - '93 Toyota Previa DX
90 day: 31.91 mpg (US)

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Found a very useful graph of tire radius vs inflation pressure for anyone interested in correction factors for tires.

Like me... I just went from the stock size/pressure of 175 65 14 @42psi to 185 65 14 @ 51 psi. I found the revs per mile but not with pressure compensation.



1.5mm change in RR between 35 and 50 psi that works out to:
1737.99mm Dia @ 35
1747.41mm Dia @ 50
difference is .5% rolling diameter. meh.

Original tires Bridgestone RE92 175 65 14 xl: 902 rev/mile
New tires: Nokian WR g2 185 65 14 xl: 884 rev/mile

2% correction for tire size and .5% for pressure= 2.5% total correction.

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