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Old 10-29-2011, 11:59 PM
ard ard is offline
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Those tire size calculators are close, but you should look at the specs for the particular tires you are considering:

go to tirerack.com- look up the model and size you have, and click on the 'specs' tab- look for the overall OD (or the revs per mile)

Try to match those numbers.

The different in revs per mile is precisely the amount the speedo or odo will be affected... a few % is no big deal. (ie 726 versus 740 is a difference of 14; 14/726~2%)

(And this advise only applies when you are changing ALL tires... different advice when mixing sizes...)

A
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