SHIMANO Rear Derailleur RD-M3100, Alivio ,SGS, 9-Speed, Top Normal Compatio_Enriched WARNING: Dimension Steerer Extender is

WARNING: Dimension Steerer Extender is not recommended for use on forks with carbon fiber steerers

and everything in between

Discrete markers take the pain out of set-up alignments

Programmable odometer

SHIMANO Rear Derailleur RD-M3100, Alivio ,SGS, 9-Speed, Top Normal Compatio_Enriched WARNING: Dimension Steerer Extender isThe SHIMANO ALIVIO RD M3100 9 speed rear derailleur delivers a low profile design that lets you ride aggressively with fewer interruptions thanks to its SHIMANO SHADOW design. The SHIMANO ALIVIO M3100 2x9 speed or 3x9 speed drivetrains receive new updated shifters and derailleurs. SHIMANO ALIVIO utilizes Shimano hallmark technologies including SHIMANO SHADOW RD derailleurs and RAPIDFIRE PLUS MONO technology in the left shifter to simplify the riding