Straight bolt-on, as far as i know. I haven't used those specific parts, but every Shimano swap I've tried has worked fine, including using mountain bike shifters with road components. Somebody will correct me if I'm wrong...RaleighXC said:I ride a lot but don't know much about bikes. I've ridden some of my friends bikes w/ the paddle shifting and liked it a lot. Is it possible to buy tiagra or 105 shifters and replace them for my sora shifters relatively easily?