microNEW Bike Rear Derailleurs Mountain Bike Rear Derailleurs 7/8/9/10/11 Speed Road Bike Rear Derailleurs 7/8/9/10 Speed Direct MountProducts Description: microNEW Bike Rear Derailleurs Model: RD M29L Material: Resin steel(economical type) For Max Rear sprocket: 36T Total capacity: 45T Applicable to: MTB 7 8 9 speed Weight: 259g Model: RD M39L Material: AL. bracket,steel plates For Max Rear sprocket: 36T Total capacity: 45T Applicable to: MTB 10 speed Weight: 256g Model: RD M59L Material: AL. bracket,steel plates For Max Rear sprocket: 36T Total capacity: 45T Applicable to: MTB 10