Shimano - M3100-SGS Alivio Rear Derailleur BMX Shortfit features the side profile

Shortfit features the side profile of the seating surface with a central depression of more than 5 mm that is similar to a curved line

NEW – Race Mode uses WiFi capability to broadcast power up to 10x faster for competitive advantage at critical race stages

- Anti-bacterial

DUB technology enhances this by simplifying the relationship of the spindle to the bottom bracket

Shimano - M3100-SGS Alivio Rear Derailleur BMX Shortfit features the side profileSHIMANO ALIVIO Rear Derailleur SHIMANO SHADOW RD 9 speed The SHIMANO ALIVIO M3100 rear derailleur delivers a low profile design that lets you ride aggressively with fewer interruptions thanks to its SHIMANO SHADOW design. Low profile design Total capacity: 45T Max. low sprocket: 36T Adjustment barrel