Well, in answer to my second question, I took the front wheel off of my commuter (which is a mountain bike with slicks) AND the disc caliper, and mounted all of it on my Redline fork (the fork is loose). It fit pretty well, although the rotor was rubbing rather heavily on the outside brake pad. I am thinking that with a fully adjustable disc brake caliper, like an Avid BB7, 135mm would work on this build.