Shimano is introducing a new, Di2-compatible second tier to its GRX gravel components range. Called RX717 and sitting below the RX820 series, it will still feature electronic shifting, while the RX600/610 series with mechanical shifting now sits third in the GRX pecking order. 

The RX717 series is solely a 1×12 groupset, and offers a long cage rear derailleur (SGS) capable of handling a 10-51T 12-speed cassette, a right hand dual control brake lever with two Di2 buttons, and a left-hand brake (only) lever. All brakes are hydraulic, as you’d expect. Shimano suggests matching these components with an RX610 chainset, an M6100/M7100 12-speed cassette, M6100 chain and RT-CL700 brake rotors, although other combinations are possible. 

The fully wireless Di2 platform offers fast and precise shifting, as well as compatibility with all Shimano 12-speed wireless shifters across its road and mountain bike component ranges. This includes GRX, Dura-Ace, Ultegra and 105, and in addition, XTR, XT and Deore flat bar Di2 shifters can be used.

Shimano GRX-RD-RX717-SGS 3
Shimano GRX-RD-RX717-SGS 3 (Image Credit: Shimano)

The RD-RX717 uses SHADOW ES technology, and its slim and low profile should lead to fewer derailleur strikes with lesser consequences.

In addition, the Automatic Impact Recovery function instantly returns the 12-speed derailleur to its original position after impact. The rear derailleur body has a wide and well-braced linkage. Solid pulleys minimise debris entry and ensure durability.

The SGS Long Cage can cope with 10-51T cassettes, and the removable onboard battery should last for between a very specific 435-621 miles of riding, depending on the conditions of course.

Shimano GRX E-Tube app
Shimano GRX E-Tube app (Image Credit: Shimano)

The right-hand lever and rear derailleur are able to be connected to the Shimano E-TUBE app, which allows choice over shifting speed, the ability to customise the shift buttons, and you can also update the derailleur firmware here.

The lever reach can also be altered to suit different riders’ hand sizes. There is an adjustment range of around 16mm that can be set using a hex key, situated behind the top of the lever.

Shimano GRX RX717 lever reach
Shimano GRX RX717 lever reach (Image Credit: Shimano)

The right lever uses two CR1632 coin-shaped batteries, which give an estimated 3.5 to 4-year lifespan, enough for even the longest of trips. Just change before you start your next round-the-world trip!

Shimano GRX Left lever BL-RS717
Shimano GRX Left lever BL-RS717 (Image Credit: Shimano)

The left lever is a hydraulic brake lever only, and has no shifting ability, as you’d expect in a 1x setup. There are two versions, which differ only by having either ‘GRX’ or ‘Shimano’ written on the lever. The Shimano-branded lever could be used as lower-cost option for riders already using Dura-Ace ST-R9270, Ultegra ST-R8170, and Shimano 105 ST-R7170, as the levers should have the same ergonomics and feel as each other.

Prices are £299.99 for a right hand STI lever and BR-RX410 front calliper (ready bled) or £219.99 for the lever only. The left-hand side costs £279.99 when paired with the equivalent rear calliper, or £179.99 for the lever only. BL-RS717 is GRX branded, whilst the BL-RS717-LS is the Shimano branded option. Finally the GRX rear derailleur RD-RX717 costs £379.99, which is £50 less at RRP than the RX827 model.