Amazon.com : ZUKKA Shimano DEORE RD-M4120 10 Speed Bike Rear Derailleur with SGS Long Cage for Mountain Bike : Sports & Outdoors
Wholesale ZTTO 1*11 Groupset 11 Speed Shifter Rear Derailleur Group Set For Mountain Bike MTB 11speed 1 x 11 kit 46T 42T 40T 11s Cassette From m.alibaba.com