NEW Shimano GRX 820 Groupset – 1 x 12 with 10-51 – Unstoppable


Shimano’s newest gravel specific group set with 12 speed mechanical shifting. This ‘Unstoppable’ is aimed mostly toward adventure riding, with a whopping 51 tooth low cog! 


We Say…

Brand new to the UK, Shimano GRX820 12 Speed Groupsets. Everything that we love about 810 but with more gear range and smaller intervals. Get yours at The Woods Cyclery today!

The 11-51t Cassette on this group-set means your covered if you like to ride high cadence, enjoy riding up hills or have plans to ride fully weighted!

Take a look at what the crew at think

Shimano GRX 12-speed Review: 800-series 1x

They Say…

The new RX820 series offers premium performance at an incredible value, with thoughtful ergonomic designs and gravel-centric gearing for all manners of unpaved adventures. Its three 12-speed Shimano GRX drivetrains deliver precise and reliable mechanical shifting with different gearing ranges to cover the full spectrum of riders and rides.



  • Lever – ST-RX820
  • Crankset – FC-RX820-1 
  • Brake calliper – BR-RX820
  • Chain – CN-M8100
Thinking about using this on your dream build? Why not browse our amazing selection of frames below and start building your dream bike. 

Browse Frames…

This Groupset does NOT include Disc Rotors or Bottom Bracket.

Additional information

Crank arm length

170, 172.5, 175

Chainring Size

40, 42



The Woods Cyclery, at 56 High St, Lyndhurst, SO43 7BG 02380 282028 [email protected]

Forest Leisure Cycling Burley Limited (company number 07192169)