REAR DERAILLEUR, RD-M3100, ALIVIO,SGS 9-SPEED, TOP NORMAL

The Shimano Alivio RD-M3100 Rear Derailleur features Shadow RD technology to keep the derailleur safe from trail obstacles. Super low profile Shadow RD technology Largest Cog: 36 Drivetrain Speeds: 9 Cage Length: Long Chain Wrap Capacity (teeth): 45 teeth Rear Derailleur Mount Type: Shimano Rear Direct Mount , 10x1 Standard