Wide link design Dyna Sys 10 speed Deore MTB front derailleur Dual Pull E type. Top swing design. Wide pivot link design for greater torsional rigidity improves shifting response and 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 and rigidity for improved shifting response. For double 38 40 tooth chainring. For 66 69 degree chainstay angle. 129g.