The Shimano Saint RD-M820-SS is a 10-speed short-cage rear derailleur engineered for the brutality of downhill and freeride riding. With Shadow+ stabilisation technology and a low-profile skid plate, it eliminates chain slap and drop so you can stay focused on the trail ahead. A unique mode converter lets you switch between downhill and freeride configurations to suit your cassette setup.

Highlights

  • Shadow+ Stabilisation: Friction-controlled clutch mechanism suppresses chain bounce and slap, keeping the drivetrain quiet and the chain on the ring through rough terrain.
  • Mode Converter: Flip between DH mode (max 28T sprocket) and FR mode (max 36T sprocket) to suit your riding style and terrain.
  • Low-Profile Skid Plate: Protects the derailleur body from rock strikes and crash impacts — a must for gravity riding.
  • Silent Bump Stopper: Urethane vibration-absorbing piece dampens derailleur noise on rough terrain, reducing driver distraction.
  • Aluminium Cage: Both inner and outer cage plates are aluminium for a strong yet lightweight construction.
  • 1x10 Optimised: Designed specifically for 1x10 drivetrains, providing clean and reliable shifting without a front derailleur.

Built for Gravity Riding

The Saint M820 groupset was developed with one purpose: to handle the most aggressive riding conditions on earth. The RD-M820-SS short-cage derailleur is the centrepiece of that system — low-slung to avoid rock strikes, with a robust body that resists deformation even after a hard crash. Shadow+ technology originated in Shimano's cross-country and trail components but was tuned for downhill and enduro demands here, offering adjustable friction resistance so you can dial in exactly how much chain stabilisation you need.

Compatibility & Fit

The RD-M820-SS is a 10-speed derailleur compatible with Shimano MTB 10-speed shifters including SL-M820, SL-M7000-10, SL-M6000, SL-M4100, SL-M640, and SL-M610. In DH mode it accepts a maximum sprocket of 28T; in FR mode (with mode converter) it accepts up to 36T. Total capacity is 25T. Designed for use with Shimano HG-X 10-speed chains (CN-HG95, CN-HG54). Pulley teeth: 11. Uses a standard direct-mount or B-link hanger attachment.

Shimano offers a limited warranty covering defects in materials and workmanship. For warranty support, return the item to Tune Cycles.
  • Shadow+ friction clutch suppresses chain slap and drop on rough terrain
  • Mode converter enables switching between DH mode (max 28T) and FR mode (max 36T)
  • Low-profile skid plate protects derailleur body from rock strikes and crashes
  • Silent bump stopper with urethane damper reduces derailleur noise
  • Short cage design keeps the derailleur tucked for improved ground clearance
  • Aluminium inner and outer cage plates for strength and low weight
  • Compatible with Shimano 10-speed MTB shifters and HG-X chains
  • Engineered for 1x10 downhill and freeride drivetrains
Speed10-speed
Cage LengthShort (SS)
Total Capacity25T
Max Sprocket (DH Mode)28T
Max Sprocket (FR Mode)36T
Min Largest Sprocket23T
Weight280g
Pulley Teeth11T
Cage MaterialAluminium (inner and outer)
TechnologyShimano Shadow+
Drivetrain1x10
Compatible ShiftersSL-M820, SL-M7000-10, SL-M6000, SL-M4100, SL-M640, SL-M610
Compatible ChainsCN-HG95, CN-HG54 (HG-X 10-speed)
SeriesShimano Saint M820
Year2013
SKU SHM-IRDM820SS1
Barcode # 4524667299684
Brand Shimano
Shipping Weight 0.3000kg
Shipping Cubic 0.001000000m3
Unit Of Measure each
Must be installed and serviced by qualified bicycle mechanic

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