A local shop owner let me test fit some 19x9.5" Volk GTC's (totally sic!) on my car, even though he knew I couldn't buy them. They are shod with 245/40's. To my suprise and disgust(no $$$ to buy!) they fit fine. Offset was 27mm, mind you they were right out to the edge of the fenderwell, and my car is lowered, with about two degrees of neg camber. I don't think you could go much bigger on tires, maybe 255's or 265's with more neg camber, tucking the top of the rim under the fender lip. Of course the down side of neg. camber is chewing up tires like they're going out of style. You would also have to roll the fenders to assure that you don't cut a nasty groove in your tires with alot of groceries in the back! Ideally, the best offset for 9.5" s is about 35-40mm, that also allows for more rubber, and less problems. With the correct offset, Ive read that you can go as big as 11" s on the rear. I believe that the guy from MDC has those, with " 315's on the back, bizzatch!"
Good luck with your setup, and remember, we must, as Supra owners constantly remind the poor front wheel drive crowd, that we can sport "Big rollers" and they can't without major surgery to their feeble, wheel hoppin' econo boxes! :gotrice:
Peace,
