Grab a workout or enjoy a long trek on and off the road with this Shimano CUES FD-U4010 front derailleur's smooth operation on 2x9-speed bikes. It provides outstanding daily riding dependability and wide range to make hills a fun challenge instead of an obstacle. Clamp for 34.9mm post (Comes with adapters for use with 28.6mm and 31.8mm posts. Smooth operation and precise front shifting on rough surfaces. Works with 48.8mm chainlines. 63-68 degree chainstay angle.