riding with two bikes, kinda like so. It is a skill every self respecting dutchman (or dutchwoman) knows. I just brought my commuter to the LBS for a drive train replacement, taking the MTB along for the return trip (too nice to be driving cars). Try not to get the handlebars to overlap in the turns. And of course its a skill that is meant to be applied in the lowlands, heading down the 10% Sapperton hill to the shoppe gets a bit tricky, having only the front brake. Pick small roads, good fun.