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how big is 235/75/r15

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31x10.5 R15 = 265x75 R15


or 10.5 inch = 266.7 mm (rounded to 265)


8 inch side wall = (31 -15)/2 = 203.2 mm (rounded to 200)


200/265 = 75% = sidewall height as a percentage of width


R15 stays the same


So a 235x75 R15 would be about 9.25 inch wide with a bit less than 7 inch sidewall so roughly:

9.25x28.85 R15


I'm thinking you want something larger.



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