Shimano Derailleur Front M371 Altus Down Dual 9 Speed 44/48T
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Shimano Front Derailleur FD-M371 Altus (Down Swing, Dual Pull, 9-Speed, 44/48T)
What Is It?
The Shimano FD-M371 Altus is a front derailleur for 3x9-speed MTB/trekking drivetrains. The “Dual Pull” design means it can route the gear cable from either top pull or bottom pull, making it flexible for different frame setups.
This version is specified for cranksets with a large chainring of 44T or 48T, and it shifts between three front chainrings (typically 22/32/44 or 24/32/48 setups depending on the bike).
Key Features
- Designed for 3x9-speed drivetrains
- Supports 44T–48T outer chainring
- Down swing design (mount sits lower, shifts more directly)
- Dual pull cable routing (top or bottom cable entry)
- Smooth and reliable Shimano Altus shifting
- Compatible with MTB and trekking bikes
- Works with standard Shimano HG 9-speed chains
- Clamp band mounting (multiple frame sizes with adapters)
Specifications
| Specification | Details |
|---|---|
| Brand | Shimano |
| Model | FD-M371 Altus |
| Type | Front derailleur |
| Speed | 3x9 |
| Action | Down Swing |
| Cable Routing | Dual Pull |
| Mount Type | Clamp band (28.6 / 31.8 / 34.9mm with adapters) |
| Chainring Compatibility | 44T–48T (outer) |
| Chainline | ~50mm |
| Chainstay Angle | 63°–69° (variant dependent) |
| Use | MTB / Trekking |
Who Is It Suitable For?
- Mountain bikers with 3x9 drivetrains
- Trekking and touring cyclists
- Riders using 44T or 48T outer chainrings
- Commuters on older MTB-style bikes
- Riders replacing worn front derailleurs
- Budget MTB builds using Shimano Altus/Acera components
Who Should Use It?
- Riders with Shimano Altus / Acera / Alivio 3x9 systems
- Cyclists needing reliable front shifting on triple cranksets
- Riders restoring older MTB drivetrains
- Commuters wanting simple, durable gearing systems
- Bike mechanics servicing 3x9 Shimano setups
