Shimano Alivio RD-M410 Rear Derailleur 7/8-Speed SGS Long Cage Direct Mount Black Aluminum and steel construction for lightweight strength Compatibility: 7/8 speed rear derailleurs Largest Cog: 34T, Total capacity: 43T, Min/Max: 11/34T Derailleur Action: Top-Normal (Traditional), Cage Length: Long cage Shimano Alivio derailleur apart from other rear derailleurs is the full-metal construction and Teflon coated bushings, allows your bike to take on even the roughest trails