Wide link design Dyna-Sys 10-speed Deore M591 MTB front derailleur Conventional swing design Wide pivot link design for greater torsional rigidity improves shifting response & service life Multi-fit compatibility means that this front derailleur will fit any frame type or seat tube size Cable routing can be used with frames built for top or bottom pull derailleurs Dyna-Sys 10-speed MTB drivetrain compatibility Reinforced steel chain guide offers high strength & rigidity for enhanced shifting response Maximum capacity of 18 teeth, & up to 42 tooth chainring For 66-69 degree chainstay angle