Shimano Deore XT M786 Shadow + Rear Derailleur - Black - GS - Medium Cage
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Product Information
Full details
This Shimano Deore XT M786 Shadow+ Rear Derailleur is designed for cyclists seeking reliable and precise shifting performance, especially on challenging terrain. Its key benefit is the Shadow+ technology that minimizes chain slap, providing a quieter and more controlled ride. A potential consideration is its specific compatibility requirements with other drivetrain components.
All features
| Model Part Number | RDM786GSL |
|---|---|
| Brand | SHIMANO |
Extended Product Information
FAQs
What is Shadow+ technology?
Shadow+ technology incorporates a chain stabilizer that significantly reduces chain bounce and chain drops on rough terrain, providing a more stable and quieter ride.
Is this derailleur compatible with 11-speed systems?
No, the Shimano Deore XT M786 is designed specifically for 10-speed drivetrains.
What is the maximum cog size this derailleur can handle?
This derailleur supports a low sprocket (largest cog) of up to 36T.
How do I engage the Shadow+ clutch?
There is typically a small switch on the derailleur body that allows you to turn the clutch mechanism on or off.
What does 'GS' mean for the cage size?
GS refers to a medium cage length, which is suitable for a wide range of gear combinations but may not offer the same chain wrap capacity as a long cage ( (or 'SGS') for very wide-range setups.
How often should I clean the derailleur?
It is recommended to clean the derailleur regularly, especially after riding in muddy or dusty conditions, to maintain optimal performance and longevity.
Can I use this with a 1x drivetrain?
Yes, with appropriate 10-speed chainrings and shifters, it can be used in a 1x (single front chainring) setup.
Troubleshooting
Chain skipping or poor shifting
Check cable tension, ensure limit screws are correctly set, and verify that the derailleur hanger is straight. Clean and lubricate the derailleur.
Excessive chain slap or noise
Ensure the Shadow+ clutch is engaged and functioning. Verify correct chain length for your gear setup. Apply lubricant to the chain.
Derailleur not shifting to largest cog
Adjust the low limit screw. Ensure the cable is properly seated and tensioned.
Derailleur cage bent or damaged
Inspect the derailleur hanger for straightness. If the cage is damaged, replacement may be necessary.
Pros and Cons
Pros
- Significantly reduces chain slap and drops on rough terrain.
- Low-profile design protects the derailleur from impact.
- Precise and reliable shifting performance.
- Durable construction for extended use.
- Clean aesthetics with direct mount option.
Cons
- May require specific chain length for optimal Shadow+ performance.
- Compatibility with non-Shimano or older-generation components should be verified.
- Installation may require specialized tools or knowledge for some users.
- Weight might be higher compared to some higher-end or minimalist derailleurs.
Setup, Compatibility & Care
Setup: Installation involves mounting the derailleur to the derailleur hanger, connecting the shifter cable, and adjusting the limit screws and B-tension. Proper cable tension is crucial for optimal performance. The Shadow+ clutch mechanism may also require initial setup or adjustment.
Compatibility: This derailleur is designed to work with Shimano 10-speed drivetrains. Ensure compatibility with your shifters, cassette (specifically the maximum low sprocket, e.g., 36T), front chainrings (maximum front difference of 18T), and chain. Always consult Shimano's compatibility charts for precise pairings.
Care: Regularly clean the derailleur body and jockey wheels to remove dirt and debris. Apply a quality bicycle chain lubricant to maintain smooth operation. Periodically check the Shadow+ clutch tension and adjust if necessary. Inspect for any signs of damage from impacts.