Shimano Deore XT M786 Shadow 10 Speed Rear Derailleur - RDM786SGSS

The Shimano Deore XT RD-M786 rear derailleur features a low-profile Shadow design that provides ex...

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Leisure Lakes BikesShimano Deore XT M786 Shadow 10 Speed Rear Derailleur Silver
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Product Information

Full details

The Shimano Deore XT RD-M786 is an ideal choice for mountain bikers running 10-speed drivetrains who prioritize chain security and durability on aggressive terrain. Its defining feature is the Shadow RD+ technology, which offers superior chain stabilization for rough trails, though it requires manual engagement of the clutch switch to function effectively during technical rides.

All features

Model Part NumberRDM786SGSS
BrandShimano

Extended Product Information

FAQs

Is this derailleur compatible with 11-speed shifters?

No, the RD-M786 is engineered specifically for the cable pull ratio and indexing of 10-speed Dyna-Sys shifters.

What is the primary benefit of the Shadow design?

The low-profile design keeps the derailleur closer to the frame, significantly reducing the likelihood of hitting rocks or logs on tight trails.

Should I keep the clutch switch on all the time?

While the switch is designed to be left on during rides, it is recommended to switch it to 'OFF' when removing the rear wheel to make the process easier.

Does this derailleur use a direct mount?

Yes, it supports the direct mount system, which provides a cleaner aesthetic and better structural alignment with the frame.

How often should I service the clutch mechanism?

The clutch should be serviced whenever you notice a decrease in chain tension or an increase in noise, typically once per season depending on riding conditions.

Troubleshooting

Shifting feels heavy or slow

Check your derailleur cables and housing for friction or contamination and replace if necessary.

Chain drops or excessive bounce

Ensure the Shadow RD+ switch is set to the 'ON' position; if it is already on, the clutch friction mechanism may require servicing.

Excessive noise from pulleys

Clean and re-lubricate the sealed bearing pulleys or replace the pulley wheels if the bearings show signs of wear.

Pros and Cons

Pros

  • Excellent chain retention on rough terrain
  • Low-profile design minimizes risk of impact damage
  • Highly durable construction with rigid outer links
  • Precise and consistent shifting performance
  • Simplified wheel removal due to efficient geometry

Cons

  • Limited to 10-speed drivetrain setups
  • Clutch mechanism requires periodic maintenance or adjustment
  • Lacks compatibility with newer 11 or 12-speed wide-range cassettes

Setup, Compatibility & Care

This derailleur is designed specifically for 10-speed mountain bike drivetrains. Ensure your shifter is compatible with the Shimano Dyna-Sys cable pull ratio. During installation, verify that the direct mount hanger is compatible with your frame's specific dropout design. Regular maintenance should include cleaning the pulleys to remove trail grit and applying a high-quality lubricant to the pivot points. Periodically check the tension of the clutch mechanism; if shifting becomes sluggish or the chain continues to bounce excessively, the internal clutch tension may need to be adjusted or serviced by a qualified technician.

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