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Are they for track use? They will work as I have run both those sizes on my Boss. The rears sit just outside the fenders but will not rub. They actually give you a nice wide track. I run 305s on them typically. The fronts will work but you will get a little close to the strut depending on tire size. A 275 will fit just fine but a 285 will likely get too close to the strut. I went with an 18 x 9.5 35mm offset up front.