Electronic GRX, single ring, huge range

GRX RX827 Di2 is the 1x version of Shimano's electronic gravel groupset: a wireless ST-RX825 right lever, a matching BL-RX825 left brake lever, and the long-cage RD-RX827 driving a 10-51T MICRO SPLINE cassette from a single chainring. It is fully wireless: the battery sits inside the derailleur, so there are no Di2 wires to route and no front derailleur to trim. This kit is the complete groupset with the crank; leave out anything you already have.

Kit includes

• ST-RX825 right Di2 shift/brake lever with BR-RX820 front hydraulic flat-mount caliper (J-kit, 1000 mm hose)
• BL-RX825 left brake lever with BR-RX820 rear hydraulic flat-mount caliper (J-kit, 1700 mm hose)
• RD-RX827-SGS Di2 rear derailleur, SHADOW ES, for single chainrings (51T max)
• CS-M8100 12-speed MICRO SPLINE cassette, 10-51T
• CN-M8100 12-speed chain, 116 links, with QUICK-LINK
• BT-DN320 Di2 battery, housed inside the rear derailleur, with the EC-DN100 USB-C charger
• FC-RX820-1 HOLLOWTECH II crankset (included) with 40, 42, 44 or 46T ring, in 160, 165, 170, 172.5 or 175 mm

Options

• Favero Assioma PRO MX-2 dual-sided power meter pedals (Shimano SPD cleats)
• Shimano road 24 mm bottom bracket for your shell
• RT-CL800 or RT-CL700 Center Lock rotors (choose size, up to two)
• SM-MA-R160-DD flat-mount adapter for a 160 mm rear rotor
• BL-RX812 sub brake levers for the bar tops

Every part can be deselected if you already have it. The RD-RX827 is the single-ring Di2 derailleur and takes MICRO SPLINE cassettes only; for a front double see the GRX RX825 Di2 kit. There are no Di2 wires, seatpost battery or charging cable in this system: the BT-DN320 clips inside the derailleur body and comes out to charge on the EC-DN100, and the lever runs on a coin cell.

Tune Cycles supplies and fits Shimano Di2 across Sydney and pairs the system before handover. Choose your options above; if you are unsure what your frame or hub takes, ask us before you order.