Wide link design Dyna-Sys 10-speed Deore MTB front derailleur Top swing design Wide pivot link design for greater torsional rigidity improves shifting response & service life E-type mounting system allows for perfect set up every time 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 For double 38-40 tooth chainring For 66-69 degree chainstay angle