There are differences in actual diameter between different brands of tires and tread wear, however, the basic math is... tirewidth x ratio of sidewall x 2 / 25.4 (to convert millimeters to inches) + diameter of wheel = diameter of tire. [ 215 (mm) x .55 (ratio) x 2 (we're doing a diameter so it's in two places) ] / 25.4 (mm's to the inch) + 16 (wheel diameter) = 25.31 inches [ 205 (mm) x .70 (ratio) x 2 / 25.4 ] + 14 = 25.29 That's close enough not to worry (70% was the ratio on the tires not 75)...but let's do the match with 75% ratio tires... [ 205 x.75 x 2 / 25.4 ] + 14 = 26.1 Standard tires (without a ratio value have the sidewall being 80% of the tread width....) [ 185 (mm) x .80 x 2 / 25.4 ] + 14 = 25.65 Syncro enthusiasts recommendation [ 215 x .75 x 2 / 25.4 ] + 15 = 27.70
On Apr 18, 2005, at 1:27 PM, JordanVw@AOL.COM wrote: > i talked to benT and he reccomended a 215-55-16 tire.. but someone > else told > me that this is "same as stock" rolling diameter of a 205 75 14??? |
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