Seeing as there is quite a wealth of knowledge I wanted to ask the question. It seems there is a general consensus to run 31x10.5 tires. This being mainly b/c of the ease of finding replacements if need be. (Yes we should still be bringing a spare or two on an expedition. Correct me if I'm wrong but when we talk 31s we are normally referring to the one on a 15" wheel. Everything I've read says a 15" wheel won't fit over the Rear Brakes? What am I missing here?