This Shimano XT T780 Top Swing Front Derailleur is a lightweight trekking derailleur for smooth gear changes. The dual pull design means that you can use it for either top or bottom pull cable routing. Band is a multi-fit clamp which assure easy & secure fit on any frame seat tube, with adaptors from 34.9, 31.8, & 28.6mm. It is 44/48 tooth outer ring compatible with a total capacity 22 teeth & is either 63-66 or 66-69 degree chainstays.