Wheel Diameter Equation
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Administrative Brown Guy
Joined: Jun 2003
Posts: 5,406
From: Ontario, Canada
Wheel Diameter Equation
Originally Posted by CanyonCarver
I did some math the other day to determine the size of tire I want to fit to my 18 X 8 wheels. In case anybody is interested.......
225/50 - 16 = 24.858" diameter stock
225/40 - 18 = 25.086" diameter will raise car .114"
235/40 - 18 = 24.401" diameter will lower car .228"
245/40 - 18 = 25.716" diameter will raise car .429"
245/35 - 18 = 24.751" diameter will lower car by .053, best for matching stock diameter.
255/40 - 17 = 25.031" diameter raises car .086" from above stock.
275/35 - 18 = 25.578" " raises car .360" "
I think I'm going for the 235/40-18's if I can find them.
225/50 - 16 = 24.858" diameter stock
225/40 - 18 = 25.086" diameter will raise car .114"
235/40 - 18 = 24.401" diameter will lower car .228"
245/40 - 18 = 25.716" diameter will raise car .429"
245/35 - 18 = 24.751" diameter will lower car by .053, best for matching stock diameter.
255/40 - 17 = 25.031" diameter raises car .086" from above stock.
275/35 - 18 = 25.578" " raises car .360" "
I think I'm going for the 235/40-18's if I can find them.
Originally Posted by CanyonCarver
255/40 - 17 = 25.031" diameter raises car .086" from above stock.
275/35 - 18 = 25.578" " raises car .360" "
width x a/r (.40 or .35 or ?) x 2 x .03937 + wheel dia.
275/35 - 18 = 25.578" " raises car .360" "
width x a/r (.40 or .35 or ?) x 2 x .03937 + wheel dia.
Registered User
Joined: May 2004
Posts: 117
From: newmarket ontario
Wheel Diameter equation cont..
Rizz i think that sticky note that was put up about the wheel diameters is incorrect. I saw it when i was looking for tire sizes. Since i want to get Toyo proxies T1Rs i was on the toyo site and referenced some of the wheel diameters. The the 235/40ZR-18 has a diameter of 25.3 inches not 24.401 inches..
Here is the site if you would like to cross-reference my numbers.. http://www.toyocanada.com/products/s...quest=Get+Data
Im going to put on 245/35ZR-18 on the front and probably 285/35ZR-18 in the rear. The Rears would be slightly off the stock height though. BTW they are going on VOLK RACING SF CHALLENGE 18-8 in the front and 18-9 or 9.5 in the rear. im trying to find a good place to get them ...
Here is the site if you would like to cross-reference my numbers.. http://www.toyocanada.com/products/s...quest=Get+Data
Im going to put on 245/35ZR-18 on the front and probably 285/35ZR-18 in the rear. The Rears would be slightly off the stock height though. BTW they are going on VOLK RACING SF CHALLENGE 18-8 in the front and 18-9 or 9.5 in the rear. im trying to find a good place to get them ...
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