Shimano / GRX

Shimano GRX RD-RX820 Rear Derailleur - Shadow RD+ | 2x12-speed - black

Description

Shimano GRX RD-RX820 Rear Derailleur - Shadow RD+ | 2x12-speed - black


Shimano GRX – United in Gravel

Gravel is the great equalizer. No matter who you are, where you come from or where you want to go. Gravel celebrates individuality. It welds together in a shared passion. It lays the foundation for friendships and creates memories for the ages. Whether you ride one kilometer or a hundred. Whether with professional equipment or without. With a 10-speed, 11-speed or 12-speed gear system. Whether on paved roads, forest roads, back roads or no roads at all. It does not matter why you are out there, all that matters is that you are.

Shimano GRX RD-RX820 rear derailleur

The mechanical Shadow RD+ rear derailleur stands for reliable and quiet shifting behavior in Gravel use. Matched to 2x12-speed drivetrains, the Shimano GRX RD-RX820 rear derailleur in combination with cassettes that feature a gradation of 11-34 teeth (CS-R8101-12, sold separately) or 11-36 teeth (CS-HG710-12, sold separately) offers a wide range of ratios with which a comfortable cadence can be ridden in any terrain.

The highlight of the Top Normal rear derailleur is the integrated chain stabilizer, which not only guarantees safer chain management on changing surfaces, but also ensures quieter shifting processes. Whether in rough terrain or on slippery terrain, the adjustable chain tensioner can be activated or deactivated by a switch as required.

Shadow RD+ | Quiet drivetrain, less distraction. The Shadow RD+ system is lighter and more efficient than roller type chain devices. A rear derailleur stabilizer reduces chain slap and is a simple solution to prevent chain drop as well.

Material: aluminum (anodized / painted), glass fiber reinforced plastic (GFRP), steel, stainless steel

Compatibility:

  • STI lever: ST-RX820, ST-RX610, ST-R7120
  • cassette: CS-R8101, CS-R7101, CS-HG710
  • chain: CN-M9100, CN-M8100, CN-M7100, CN-M6100

(manufacturer recommendations, list not exhaustive)

Weight (manufacturer's specification): approx. 270 g

Shimano Parts
Fact Sheet
Product Name: Shimano GRX RD-RX820 Rear Derailleur - Shadow RD+ | 2x12-speed - black
Manufacturer: Shimano Parts
Item Code: SHI661877
activity: Cycling
material: Aluminium
usage bikesport: Cyclocross, Allroad / Gravel
Shifting System (Manufacturer): Shimano
Number of Gears - rear: 12
Shifting Type: Chain - Mechanical
Smallest Sprocket: 11
rear derailleur cage: medium
rear derailleur max. teeth: 36
rear derailleur capacity: 42
max. chainring spread teeth: 17
rear derailleur mounting: conventional
Model year: 2025
Collection: Full year
Color: Black
weight: 270g
manufacturer item code: IRDRX820
Weight Source: Manufacturer
Product Series: Shimano - GRX
GTINs: 4550170303617
Manufacturer page: http://www.shimano-europe.com/
Availability
Ratings (1)
Manufacturer

Shimano

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