Wide link design Dyna-Sys 10-speed Deore M590 MTB front derailleur Top swing design Wide pivot link design for greater torsional rigidity improves shifting response & service life Multi-fit compatibility means that this frontderailleur 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