tire sizes
Posting Guru
Joined: Nov 2009
Posts: 2,016
Likes: 3
From: NC
Make sure you get your PCM reprogrammed for the correct tire size (or your odometer and speedometer will be off).
Please note even if properly programmed, your speedometer will always read 2-3% FAST (i.e., will read about 67 when you're really travelling 65).
Please note even if properly programmed, your speedometer will always read 2-3% FAST (i.e., will read about 67 when you're really travelling 65).
Posting Guru
Joined: Nov 2009
Posts: 2,016
Likes: 3
From: NC
Good deal. Make sure you account for squish.
Your unloaded diameter should be about 33.2" (843.5 mm), 2650 cm circumference or 607 revs/mile. With a 3% squish (most tires are between 3-5%), you should be about 2446 cm or 626 revs/mile.
Always verify with a GPS or known distance.
Your unloaded diameter should be about 33.2" (843.5 mm), 2650 cm circumference or 607 revs/mile. With a 3% squish (most tires are between 3-5%), you should be about 2446 cm or 626 revs/mile.
Always verify with a GPS or known distance.
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