65 Stepside C10 (What is the widest tire/rim I can run)

[forestb]

I have a set of 275/55ra7 in the rear on a 17x8 wheel and it is really close. I had to flair the lip of the fender to get them to fit. I have 275/50r17 up front. It also depends on how low your truck is. I have a 5 inch drop in the rear. It can also vary by truck. some fenders are a little smaller thinner than others and it can also depend on the lean of the bed side. I used to have a set of 275/60r15 with a 15x7 on the rear and they fit fine with no lip rolling.