Does any body know the math to figure this out..
#2
Take the tire width in millimeters, say 235. Multiply it by the aspect ratio, say .45 (dont forget the decimal), that's the sidewall height in mm. Now divide that # by 25.4 to convert to inches. Take 2 times that # and add the rim diameter and you should get the overall diameter. The 235/45/17 should be 25.33 in dia.
#3
If you mean the outer diameter......
What you do is take the tread width and divide it by 25.4. This will give you the width in inches, next take that number and multiply it by the aspect ratio of the sidewall. Then you add the diameter of the rim to get the results. For example my tires are 195/60-15s. So I take 195/25.4 = 7.677", now I take 7.677 x 1.2 (0.60 x 2) and I get 9.21". Then I add the 15" rim and my OD (outer diameter) equals 24.21 inches. However this is assuming the tire is a perfect circle. When I actually measured the diameter (vertically) it was 23.25". Your best bet is to measure the diameter of your wheels vertically (top of tire to the bottom of it). And find a shorter rim+tire combo that fits above your brakes. If I can make a suggestion some stock 15" wheels with BFG drag radials in 205/50-15s would give the best results for the strip. This would in effect give you a final gear of 4.00 vs 3.62 stock.
#4
Re: If you mean the outer diameter......
Originally posted by Nismo87SE
What you do is take the tread width and divide it by 25.4. This will give you the width in inches, next take that number and multiply it by the aspect ratio of the sidewall. Then you add the diameter of the rim to get the results. For example my tires are 195/60-15s. So I take 195/25.4 = 7.677", now I take 7.677 x 1.2 (0.60 x 2) and I get 9.21". Then I add the 15" rim and my OD (outer diameter) equals 24.21 inches. However this is assuming the tire is a perfect circle. When I actually measured the diameter (vertically) it was 23.25". Your best bet is to measure the diameter of your wheels vertically (top of tire to the bottom of it). And find a shorter rim+tire combo that fits above your brakes. If I can make a suggestion some stock 15" wheels with BFG drag radials in 205/50-15s would give the best results for the strip. This would in effect give you a final gear of 4.00 vs 3.62 stock.
What you do is take the tread width and divide it by 25.4. This will give you the width in inches, next take that number and multiply it by the aspect ratio of the sidewall. Then you add the diameter of the rim to get the results. For example my tires are 195/60-15s. So I take 195/25.4 = 7.677", now I take 7.677 x 1.2 (0.60 x 2) and I get 9.21". Then I add the 15" rim and my OD (outer diameter) equals 24.21 inches. However this is assuming the tire is a perfect circle. When I actually measured the diameter (vertically) it was 23.25". Your best bet is to measure the diameter of your wheels vertically (top of tire to the bottom of it). And find a shorter rim+tire combo that fits above your brakes. If I can make a suggestion some stock 15" wheels with BFG drag radials in 205/50-15s would give the best results for the strip. This would in effect give you a final gear of 4.00 vs 3.62 stock.
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