Shimano Altus Front Derailleur - 9-Speed Dual-Pull Conventional Swing
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This guide is for recreational mountain bikers seeking a reliable and affordable front derailleur. The Shimano FD-M371 Altus offers smooth, dual-pull shifting and wide compatibility for 9-speed drivetrains, making it a solid upgrade for many bikes. A potential consideration is its compatibility with specific chainstay angles.
All features
| Model Part Number | FDM371X6 |
|---|---|
| Brand | SHIMANO |
Extended Product Information
FAQs
Is this derailleur compatible with 10-speed systems?
No, the Shimano FD-M371 Altus is specifically designed for 9-speed drivetrains.
What is the maximum size chainring this derailleur can accommodate?
It is designed for outer chainring sizes ranging from 44 to 48 teeth.
Can I use this derailleur with a road bike?
This derailleur is designed for MTB (mountain bike) fitment and recreational off-road use. While it might be physically compatible, its performance characteristics are optimized for mountain bike geometry and riding styles.
What does 'Dual-Pull' mean?
'Dual-Pull' means the derailleur can accept gear cables coming from either the top of the handlebar (top-pull) or the bottom (bottom-pull), offering flexibility in how your bike is internally or externally cabled.
How do I know if my bike's chainstay angle is compatible?
The derailleur is designed for a chainstay to seat tube angle range of 66-69 degrees. Many modern mountain bikes fall within this range. Consult your bike's specifications or a bike mechanic if unsure.
What is the 'Conventional Swing' design?
Conventional Swing refers to a design where the derailleur body swings outward and away from the frame as you shift to larger chainrings. This design generally provides a positive shifting action.
Troubleshooting
Chain rubbing on the outer cage in high gear
Adjust the 'H' (high) limit screw slightly counter-clockwise. Ensure cable tension is correct.
Chain rubbing on the inner cage in low gear
Adjust the 'L' (low) limit screw slightly clockwise. Ensure cable tension is correct.
Shifting is slow or hesitant
Check cable routing for kinks or friction. Clean and lubricate derailleur pivot points. Ensure cable tension is properly set.
Derailleur cage is bent or damaged
Inspect the derailleur cage for damage. If bent, it may require replacement for proper shifting performance.
Pros and Cons
Pros
- Offers reliable shifting for recreational use.
- Dual-pull cable routing provides installation flexibility.
- Wide linkage design contributes to reduced effort and increased rigidity.
- Multi-fit clamp ensures compatibility with a wide range of frame sizes.
- Affordable price point for an entry-level to mid-range component.
Cons
- Primarily designed for recreational use; may not meet the demands of aggressive riding.
- Compatibility is specific to 9-speed drivetrains.
- Requires specific chainstay to seat tube angle (66-69 degrees) for optimal performance.
- Outer chainring size is limited to 44-48 teeth.
Setup, Compatibility & Care Instructions
Setup: Ensure the derailleur is mounted securely to the seat tube using the appropriate clamp size. Adjust the derailleur height so the outer cage plate is approximately 1-3mm above the teeth of the largest chainring. Set the limit screws (`L` for low gear, `H` for high gear) to prevent the chain from overshifting off the smallest or largest chainring, respectively. Route the shift cable through the appropriate pull mechanism (top or bottom) and connect it, adjusting for precise shifting performance. Compatibility with a 66-69 degree chainstay to seat tube angle is recommended for optimal function.
Compatibility: This derailleur is designed for 9-speed drivetrains and is compatible with outer chainring sizes ranging from 44 to 48 teeth. The total capacity is 22 teeth (difference between largest and smallest chainring). Ensure your crankset and shifters are also designed for a 9-speed system.
Care: Keep the derailleur clean from mud, dirt, and debris. Periodically wipe down the cage and pivot points. Apply a light bicycle-specific lubricant to the pivot points and cable anchor bolt as needed to ensure smooth operation. Avoid using high-pressure water jets directly on the derailleur, as this can force water into the bearings and pivot points.