Shimano's Deore XT Dyna-Sys 10-speed Front Derailleur sports a lightweight aluminum cage that's chrome plated to reduce wear, and the body boasts wide parallel pivots that provide fast, smooth, and reliable shifts every time. This model is specifically optimized for 3x10 set ups and can handle 42-tooth cassettes. The clamp is compatible with 28.6, 31.8, and 34.9mm tubes.
The dual-pull design allows this derailleur to be used with top- or bottom-pull cable routing.
Your seat-tube diameter determines the needed derailleur clamp size.