Shimano GRX supports disc brakes only and this makes sense considering the improved tyre clearance and better performance under rough conditions. Its ergonomics (shape) were redesigned to improve comfort and control on bumpy terrain (it has anti-slip ridges on the hood).
Each lever has 2 E-tube ports. It does not have a dedicated sprint shifter port, so you cannot use the SW-R610 with these levers.
The weight of 373g is for a pair of levers, not a single lever.
The clamp band inner diameter is 23.8-24.2mm.
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Even though I strongly recommend you use the GRX hydraulic disc brakes, there are no doubt people wanting to run cable-actuated disc brakes due to financial reasons. In that case you will not be able to use the GRX levers. These levers support hydraulic disc brakes only. You can use any other Shimano Di2 Dual Control Lever though, like the ST-6870, ST-9070, ST-R8050 or ST-R9150
The GRX ergonomics are excellent for gravel riding, but if you're looking for other hydraulic disc levers, have a look at the Ultegra ST-R8070 and Dura-Ace ST-R9170.
Modern Di2 shift levers have buttons on top of the hoods, but unless you're on 12-speed Di2, their default function only works with a wireless unit or d-fly. Learn how to set these buttons to shift derailleurs.
Learn how to install Di2 drop bar levers commonly used on Di2 road bikes or Di2 gravel bikes. I'll walk you through the process and give you some useful tips.
Do you have small hands? Or extra large hands? Read this page to figure out how to change your Shimano Di2 shift lever (or shifter) reach.
Below is an overview of all known firmware updates for this component. The changelog texts are Shimano's, and quite often they're a bit cryptic - sorry!
3.3.0
Changes due to the release of firmware for related units. (No change for the use of ST-RX815)
3.2.1
Firmware uploaded
