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Shimano GRX Di2 RX815 Groupset 1x11-speed

Shimano GRX Di2 RX815 Groupset 1x11-speed

Shimano GRX - Explore beyond

Instead of telling gravel riders what they needed, Shimano asked them what they wanted for their offroad adventures. The result are the Shimano GRX components which represent the first series especially developed for riding on rough roads and through gravel. The Shimano GRX sets itself apart from the rest of the component world with its gravel specific ergonomics, optimized gearing options, rugged reliability as well as a quiet and stable drivetrain.

Content of the Shimano GRX Di2 RX815 / RX817 1x11-speed groupset:

  • GRX Di2 ST-RX815 shift/brake lever (left + right)
  • GRX BR-RX810 disc brake caliper (front + rear)
  • GRX FC-RX810-1 crankset
  • GRX Di2 RD-RX817-GS Shadow RD+ rear derailleur - medium
  • Deore XT CS-M8000 cassette (11-40 or 11-42 teeth)
  • CN-HG701-11 chain - 116 links
    (incl. SM-CN900 Quick Link chain connector)
Hubs, brake discs and bottom bracket cups are not included. These can be ordered separately.


Please note that the RD-RX817-GS rear derailleur is only compatible to the CS-M8000 cassette with the 11-40 and 11-42 teeth sprocket ratio.

Shimano GRX Di2 ST-RX815 shift/brake lever

The electronic/hydraulic Shimano GRX Di2 ST-RX815 dual control lever provides Gravel inspired ergonomics. Particularly striking is the shape of the handle whose hood head is raised to prevent misalignment while the recessed finger notch prevents the hand from slipping upwards. Like the handle, also the lever features an anti-slip coating for greater mixed-terrain control.

In terms of shifting performance the 2x11-speed GRX Di2 STI lever can take full advantage of the well-known digital precision of the Shimano Di2 electronic shift systems and the Synchronized Shifting technology. In contrast the braking performance is optimized by the brake lever's rotary axle which is positioned 18 mm higher than usual and Shimano's SERVOWAVE technology improving the lever's modulation ability.

In addition, the programmable Di2 shift/brake lever features three switches (two on the side and one on the hood's top) that can be used to operate third-party devices such as compatible lights or bike computers. In order to meet the individual needs of the driver, the hydraulic brake lever offers reach and free stroke adjustment as well.

Shimano GRX BR-RX810 disc brake caliper

Never hesitate to tackle rough surfaces with the hydraulic Shimano GRX BR-RX810 caliper. In doing so Ice Tech ensure excellent heat dissipation while the BR-RX810's 2 ceramic pistons guarantee excellent braking performance under all conditions. The Flat Mount system makes it possible to attach the disc brake caliper directly at frame or fork. Trouble-free and simple maintenance is provided by the proven One Way Bleeding concept and the Easy Hose Joint System which simplifies brake hose exchanges (brake hose sold separately).

Shimano GRX FC-RX810-1 crankset

Shimano's GRX cranks are designed to handle a wide variety of terrain and riding styles and feature a 2.5 mm wider chainline for more freedom in frame design and the use of wider tires.

The GRX FC-RX810-1 Hollowtech II crankset relies on a 1x11-speed drivetrain concept and offers the optimum gearing for every terrain and riding style thanks to Shimano's wide range of cassettes and sprocket ratios. For the aluminium crank with a 50.1 mm chainline you can choose between a 40 or 42 teeth chainring which is suitable for the use with HG-EV and HG-X11 chains.

Shimano GRX Di2 RD-RX817-GS Shadow RD+ rear derailleur

The electronic Shimano GRX Di2 RD-RX817 rear derailleur is characterized by quiet, smooth, precise and reliable shifting even in the most demanding terrain. This is mainly due to the Shadow RD+ chain stabilisation system which prevents the chain from slapping and dropping as well as from unnecessary movements of the derailleur's cage, thus ensuring uninterrupted shifting performance. That is why an On/Off switch can be found next to the upper pulley, much like Shimano’s mountain bike derailleurs. When activated the rear derailleur pivot takes a firm hold to reduce excessive movement, noise and general "chain chatter".

The RD-RX817 rear derailleur is suitable for 11-40 and 11-42 teeth cassettes. Jockey wheels with 11 teeth ensure a reduced noise level and increased riding comfort.

If you need more detailed information about the single parts of the groupsets check the articles in the referring categories.

Manufacturer's item codes:

  • shift/brake system: IRX815DLF6SC100 + IRX815DRRDSC170
  • crankset: IFCRX8101CXB0 | IFCRX8101DXB0 | IFCRX8101EXB0 | IFCRX8101CXB2 | IFCRX8101DXB2 | IFCRX8101EXB2
  • rear derailleur: IRDRX817
  • cassette: ICSM8000140 | ICSM8000142
  • chain: ICNHG70111116Q

Included in delivery: see description
without brake discs and bottom bracket

Fact Sheet of Shimano GRX Di2 RX815 Groupset 1x11-speed

Product Name: Shimano GRX Di2 RX815 Groupset 1x11-speed
Manufacturer: Shimano Parts
Item Code: SHI442158
activity: Cycling
usage bikesport: Road Bike, Gravel
crank arm length: 170, 172.5, 175
groupset: Shimano Di2 (electronic)
gear ratio: 11-13-15-17-19-21-24-27-31-35-40
number of chainrings: 1
shifting system: 11-speed
shifting actuation: Electronic
brake type: Disc Brake
bottom bracket axle profile: 24mm Hollow Shaft
brake actuation: Hydraulic
rear derailleur cage: medium
rear derailleur max. teeth: 42
rear derailleur capacity: 31
Color: Black
Manufacturer page: