My RSA with the Gumpert Apollo
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DFWERDOC: I run with about 5 different RSA's from time to time, and none of them use 18s...all use 17s. I use 275 in back, 245 up front. Rolled fenders, camber at least -2 degrees. Two guys I know run 295 in the back with 5mm spacers, on 17 inch wheels, but there is some occasional rubbing on tracks with big camber changes.
As for my wheels specifically, my track wheels are 17 x 8.5 front, 17 x 11 in back. I know some guys that are using 17 x 8 and 17 x 10. Hope this is helpful!