I'm wanting to setup my Tricross Comp to be able to climb mountains and was wondering how this setup would work. I have two wheelsets for it with one having a 12/25 cassette for the normal riding/commuting that I do and the other I plan on putting on a 11/34 cassette for climbing. My crankset is an Ultegra 52/39. If I change the short cage Ultegra RD to a mountain long cage RD can I get away with just changing out the wheels and not have to worry about chain wrap? I'd rather not have to change the chain when I want to change wheels.