Hello,
My 70 Challenger has P235/60-15's (T/A's) mounted all around. I haven't had a spare since I've owned the car, but recently came across a steel 15x7 rim that I plan to use as the spare (can't afford the oem "space saver" option right now).

My question is -- given the small size of the E-Body trunk, does it make sense to get the same size tire mounted on that rim (to match the other 4) or go with something smaller? Can you even run a smaller tire like this, if I needed to swap it in due to a blowout, etc?

Thanks a lot!