Electronic GRX with a front double

GRX RX825 Di2 is Shimano's electronic gravel groupset: the ST-RX825 levers talk wirelessly to the derailleurs, the RD-RX825 and FD-RX825 run off one BT-DN300 battery hidden in the frame, and shifting is the same fast, exact Di2 as Ultegra. The 48-31T double with an 11-36T cassette covers fast tarmac and steep dirt without a gap. 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)
  • ST-RX825 left Di2 shift/brake lever with BR-RX820 rear hydraulic flat-mount caliper (J-kit, 1700 mm hose)
  • FD-RX825 Di2 front derailleur, braze-on
  • RD-RX825 Di2 rear derailleur, SHADOW RD+, for double cranks (36T max)
  • CS-R7100 12-speed cassette; choose 11-34T or 11-36T (HG freehub)
  • CN-M8100 12-speed chain, 116 links, with QUICK-LINK
  • BT-DN300 internal Di2 battery, EW-SD300 wires (1200 mm to the rear derailleur, 700 mm to the front) and EW-EC300 charging cable
  • FC-RX820-2 HOLLOWTECH II crankset (included), 48-31T, in 160, 165, 170, 172.5 or 175 mm

Options

Every part can be deselected if you already have it. The RD-RX825 is the double-specific Di2 derailleur (11-34 or 11-36T cassette, FD-RX825 up front); for a 1x build see the GRX RX827 Di2 kit. The battery and wires fit inside the frame; the levers run on coin cells.

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 takes, ask us before you order.

Shimano offers a limited warranty covering defects in materials and workmanship on every component in this kit. For warranty support, return the item to Tune Cycles.

  • Shimano GRX RX825 Di2 12-speed electronic shifting: wireless levers, wired derailleurs on one internal BT-DN300 battery
  • ST-RX825 Di2 DUAL CONTROL levers with GRX ergonomic hoods and hydraulic BR-RX820 flat-mount calipers, supplied as bled J-kits
  • RD-RX825 Di2 SHADOW RD+ rear derailleur and FD-RX825 Di2 front derailleur for a 48-31T double
  • Cassette choice: CS-R7100 11-34T or 11-36T on a standard Shimano HG road freehub
  • Battery, two EW-SD300 wires and EW-EC300 charging cable included
  • Editable kit: bottom bracket, rotors, adapter and sub levers are optional, and any part can be deselected
  • FC-RX820-2 HOLLOWTECH II 48-31T crankset included, in 160 to 175 mm
Brand Shimano
Series GRX RX825 Di2
Drivetrain 2x12-speed, Di2 electronic
Levers ST-RX825 right (12-speed) and left (2-speed), wireless Di2, hydraulic
Brakes BR-RX820 hydraulic flat-mount calipers, front 1000 mm / rear 1700 mm hoses
Front Derailleur FD-RX825 Di2, braze-on
Rear Derailleur RD-RX825 Di2, SHADOW RD+, 36T max low sprocket
Cassette CS-R7100 12-speed, 11-34T or 11-36T, HG freehub
Chain CN-M8100 12-speed, 116 links, QUICK-LINK
Electronics BT-DN300 battery, EW-SD300 wires 1200 mm + 700 mm, EW-EC300 charging cable
Crankset FC-RX820-2 HOLLOWTECH II 48-31T, 160 / 165 / 170 / 172.5 / 175 mm
Bottom Bracket (optional) Shimano road 24 mm spindle, to suit shell
Rotors (optional) RT-CL800 / RT-CL700 Center Lock, up to two
Kit Type Editable kit — every part can be deselected
SKU SHM-RX825-2-GROUP
Brand Shimano

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