Thanks for the responses! From what I can determine the 245/60/15 on a 15 x 7 will give me the same sidewall and and same threadwith as I have now with the 245/60/14 on a 14 x 7. The only difference is the 15" tire diameter is 26.6" whereas the 14" is 25.6". Ponchro, when I measure my backspace, I measure from the drop inside the rim, not the outside lip. When I measure from the drop, I get 4 inches on both my 15 x 7 and 14 x 7 rims.
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