From everything I've been able to gleen from this site, BFG KDW 225/50YR16 (section width = 9.2") are the widest tires that will fit w/o rubbing on rear strut or fender liner. If I'm wrong, someone will point it out

2004 Velocity Red RX-8 *Racing Beat Intake and Exhaust *Grand Touring Package *Red/Black Leather *Fender Strakes *Rotary Accents *Xenon HID's *Bose