It makes absolutely no sense carrying two cassettes. One cassette can pretty much cover all the gear inches you're looking for. Also, if you're thinking of carrying or pulling a load, I would seriously think about changing out your chainrings.... even swapping your crankset to a triple.... that and the right cassette will give you all the range you'll ever need.
Last edited by roadfix; 01-14-05 at 04:48 PM.