I'm running 5" bs with 245/45/18's in front and 5.25" with 255/55/18 in the rear. I have some rubbing on ls inner fender lip and lots of clearance on the other side. The rearend is not completely centered which isn't unusal, I've been told. If your car is already lowered be careful. I can send pics of my stock front height and 1" lowered rear. 18's really fill the fenders without sacrificing ground clearance.
'69 RS/SS X-22 M21 Lemans Blue #'s matching. '99 HD Night Train