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Mach V Dan was able to run 245's on an R56 with a bit of rubbing, I run 225's on my R53 with no rubbing. The R56 has a bit more space then the R53, so you should be alright (assuming a reasonable offset).
225 will work fine. I have 235/40 on mine, so width should be fine as long as you keep your offset in check. Plus 225/45 is only 2.9% slower than stock... not too bad of a speed change. Do eeet.