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Old 07-10-2008, 11:36 AM
Orient330iNYC's Avatar
Orient330iNYC Orient330iNYC is offline
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Mein Auto: Daihatsu Terrios
Originally Posted by anE934fun View Post
Where did you get the data on wheel + tire diameter?

Add me to those who are interested in your testing results.
easy... tire size is: tirewidth/sidewall height (expressed as a % of tire width) / rim size.

stock tire size is 225/40/18


3.54*2= 7.08" +18"= 25.08" diameter

spare tire size: 135/80/17


4.25*2=8.5"+17"=25.5" diameter

25.4 is the mm -> inch conversion.
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