The Shimano Alivio FD-M3120-M-B Front Derailleur is a SIDE SWING, clamp band mount front derailleur engineered for 2x9-speed MTB drivetrains. Designed for smooth, precise, and quiet shifting, it features enhanced cable routing that reduces lever effort and improves overall efficiency. The SIDE SWING design also provides increased clearance for large wheels and short chainstays, making it ideal for modern trail and rear-suspension mountain bikes.

Compatible with front double chainrings (36-22T), this derailleur offers powerful outward shifting, reduces chain rub, and accommodates wider traction ranges. Its versatile mounting options (D, E, M types) and clamp band sizes ensure wide frame compatibility, while supporting up to 2.3-inch tires on wider rims.

Key Features:

• Model: Shimano Alivio FD-M3120-M-B

• Series: Shimano Acera M3000 Series

• Speed Compatibility: 2x9-Speed

• Mount Type: Clamp Band (ø34.9 mm standard; adapters for 28.6 mm S and 31.8 mm M)

• Technology: SIDE SWING for smoother, lighter cable routing

• Chainline: 51.8 mm

• Chainring Compatibility: 36-22T front double

• Action: Front-pull

• Frame Compatibility: Wide range, suitable for short chainstays and large wheels

• Chainstay Angle: 64–69°

• Total Capacity: 14T

• Features: Angled stroke adjust screw, angled clamp band, 4 link bushings

• Tire Compatibility: Up to 2.3-inch on wider rims

• Reliable, versatile front derailleur optimized for off-road MTB performance and modern frame geometries