I have 4.5" on an 8" rim and it's as far in as I'd feel comfortable going.
how would a NARROWER wheel rub and a wider one not, with the same backspacing?
this "backspace" thing has me confused anyway. i'm used to offsets such as +23, +25, etc. so i'm trying to learn. i'm wanting to make sure a 15x8 wheels with 4.5 backspace will fit front and rear.
maybe?