If you are only doing the occasional triathlon, and you have your standard road position dialed in perfectly, I would not move anything--on the other hand, I wouldn't be caught dead doing anything involving running either. It really depends on how picky your body is about position. I know people that can go from one bike to the next with no problems at all, but once I get my position set up I don't want to touch another bike. Its really up to you though--you have to pick the riding position you'd be more comfortable in.