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The fronts on my car were 245/40-18 and the 285/35-18's on the back. The front tires are definitely smaller sidewall than the rears. But if they are equal, then go for it. I think that the 275/40-18's are probably a little tall to begin with so might wanna go with the 40 profile rather than the 45 because your profile will be the same as the stock tires and you have another 1" of wheel with those saleens. Just something to think about.