dont do that... get 235/40/17
i'm running 225/45/17's on H&R race springs, and i regret not going up a size... let alone down a size! i have some great 90% tread fuzion zri's in the above size for sale..
also, 225/45/17,235/40/17, and 115/50/17 i think are all REALLY REALLY close to same overall diameter...
'92 325is 5sp