I know nothing about small size differences and technical talk, but I do know that I put a set of 225/50/16 Firestone (hey, if anyone's watching their quality control right now, it's them) SZ50EPs on my completely stock '99 SVT and haven't experienced one bit of rub. Not going fast, not going slow, not hitting a big bump, not taking right-angle turns at vastly higher speeds than would be prudent, nada

. I haven't had them long enough to judge even-ness of wear, though.
christopher