Shimano GRX RD-RX812 Rear Derailleur (Black) (1 x 11 Speed) (Long Cage) (Shadow Plus)

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The Shimano GRX FD-RX812 rear derailleur features an integrated chain stabilizer to keep the shifting smooth and precise over a variety of terrain.

Features:

  • Adjustable chain stabilizer prevents chain slapping and drops
  • Switch stabilizer ON/OFF to match the terrain
  • Gravel-tuned clutch tension
  • 1x-specific rear derailleur

Specifications:
Speed: 1 x 11 Speed
Shifter Compatibility: Shimano Road (11 Speed)
Shift Mechanism: Cable Actuated
Max. Tooth: 42T
Min. Tooth: 11T
Chain Wrap Capacity: 31T
Cage Material: Aluminum
Chain Retention: Shadow Plus
Color: Black
Weight: 267g

This product was added to our catalog on August 13, 2019

Benjamin Stern
Verified Owner
Wednesday, Aug 16 2023 (about a year ago)
Shimano GRX RD-RX812 Rear Derailleur (Black) (1 x 11 Speed) (Long Cage)
I used this to switch over my gravel bike from 2x11 (48-32 crank, 11-34 cassette) to a 1x11 with 11-46 cassette. Here's a little secret: the GRX RD-RX812 works just fine with a 11-46 cassette, no goat link or cage mod required, as long as you get the chain length and B-screw adjustment right.
1 customer found this review helpful.
Alan White
Verified Owner
Monday, Nov 6 2023 (about a year ago)
Shimano GRX RD-RX812 Rear Derailleur (Black) (1 x 11 Speed) (Long Cage)
I moved up on my TREK Emonda, replacing a 30 tooth max rear cassette with a 40 tooth max rear cassette. This modification calls for a long cage rear derailleur. The GRX RD-RX812 is just exactly right for the task. Much happiness. Steep hills and stiff headwinds are no longer a problem. The weight penalty came out to about one half of a pound.
Noah Holmes Foster
Verified Owner
Tuesday, Oct 11 2022 (about 2 years ago)
Shimano GRX RD-RX812 Rear Derailleur (Black) (1 x 11 Speed) (Long Cage)
As good as it gets for mechanical shifting on a 1x gravel/all-road bike! Smooth shifting, easy set up, and reasonable price.
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