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Old 28th January 2010, 14:58   #1
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Red face Rolling Radius Formula

Hey people. I'm kinda new in team-bhp, and my first question is really technical.. i've been searching the net a lot and cant find the formula to calculate the rolling radius of a tire. I know there are online calculators, but i want to know the formula too....help!!!
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Old 28th January 2010, 23:44   #2
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i guess you mean the rolling circumference which is 2x3.14xRadius.
Radius of tyre = sidewall height + rim radius .
For eg : 145/80R12 mean 145mm width , Tyre Sidewall Height = 116 mm , Rim Radius = 6inch = 152.399 mm.
So total tyre radius = Sidewall + Rim Radius = 116 + 152.399 = 268.39 mm
Now Total Rolling circumference = 2x3.14x 268.39mm = 1685.48 mm = 66.35 inch

However please not that this may vary for even the same tyre depending on air pressure as it changes the sidewall height.

Regards

Last edited by Trust_In_Thrust : 28th January 2010 at 23:46.
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Old 28th January 2010, 23:51   #3
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Car Bibles : The Wheel and Tyre Bible Page 3 of 4
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