Shimano GRX 812 Rear Derailleur - 11 Speed
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Shimano GRX 812 Rear Derailleur - 11 Speed
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Code: RD-RX8
Shimano GRX 812 Rear Derailleur - 11 Speed
With an integrated chain stabilizer mechanism, the Shimano GRX derailleur provides a quieter experience and shifting security and precision on mixed terrain. For rides on smooth surfaces, the derailleur features and ON/OFF switch for the chain tensioner. 
  • Adjustable chain stabilizer prevents chain slapping and drops
  • Switch stabilizer ON/OFF to match the terrain
  • Gravel-tuned clutch tension
  • Compatible with current road Dual levers
  • Top sprocket: Max. 11T/Min. 11T
  • Low sprocket: Max. 42T/Min. 40T
  • Total capacity: 31T
  • Designed for a 1 x 11 speed chainset up to 42T a cassette
  • Smooth and reliable mixed surface shifting
MHS Reliable, accurate rear shifting time after time. The clutch mechanism keeps it all quiet and rattle free. Looks superb too.
Ben Brilliant rear mech. Great shifting with 105 STI levers. Stops chain slap. Easy to instal and set up. Plenty of room for 11-42 cassette. Will update the review once i try the 9-46
Mr Knowles Prompt divery and a good price. Usual high Shimano quality and slick shifting.
Mr P This derailleur has completely eliminated chain slap on my gravel bike, it is a little pricey but a worthwhile upgrade for sure.
Lee Very smooth shifting
Andrew Will go well with my 11-42 cassette. Quick shipping as always to US
Phil Excellent rear mech which is compatible with the largest of cassettes. Feels like superb shimano quality which is reassuring for the type of riding I do.
David Fits perfectly with M7000 11-42 cassette for some great climbing
JC What a difference compared to the Sram derailleur I had on there. Chain retention is spot on.