SHIMANO SHIFT/BRAKE LEVER ST-RX815 DI2 LH W/BR-RX810 RR

Take on rough, mixed-terrain roads with confidence. The Shimano GRX RX810 hydraulic disc brake kit pairs a left ST-RX810 dual-control lever with a BR-RX810 flat-mount caliper, delivering Ultegra-level braking power and modulation tuned specifically for gravel and adventure riding. The kit arrives pre-bled with hose already connected, ready to fit straight to your bike.

Highlights

• SERVOWAVE technology: brings pads into contact early in the stroke for powerful initial bite then fine modulation — ideal for loose, variable surfaces.
• ICE TECHNOLOGIES finned resin pads: dissipate heat efficiently to reduce fade, maintain consistent feel, and extend pad life on long descents.
• Flat-mount BR-RX810 caliper: low-profile design integrates cleanly with gravel and road frames; dual ceramic pistons for even pad contact.
• GRX ergonomics: lever hood positions hands higher and further in for secure grip on rough terrain; reach and free-stroke are fully adjustable.
• Pre-bled, 1700mm hose: arrives ready to install with the hose already joined — less setup time, no bleeding required out of the box.
• Easy maintenance: Shimano’s One-Way Bleeding system and Easy Hose Joint (J-Kit) make routine servicing clean and straightforward.
• Mineral oil hydraulics: reliable, long-service fluid that is less aggressive than DOT fluid and widely available.

Built for gravel control

The GRX RX810 lever positions your hands for a secure hold over rough terrain while the SERVOWAVE mechanism engages the pads early in the lever stroke. The result is confident, progressive braking — strong initial response with the fine modulation needed to scrub speed precisely on gravel, dirt, and loose descents without locking a wheel.

Consistent heat management

Shimano ICE TECHNOLOGIES finned resin pads draw heat away from the braking surface, helping keep braking feel consistent and quiet on sustained descents while extending pad life. The included K03S pads are also compatible with K04S and L04C pads for different conditions.

Compatibility & Fit

This is the left-lever, rear-caliper kit — the left lever controls the rear brake in the standard Australian setup. Suited to 11-speed Shimano road and GRX drivetrains. The BR-RX810 caliper uses a flat-mount interface and is supplied without a rotor adapter, configured for a rear frame mount thickness of 25 mm. Uses Shimano mineral oil only. If you are unsure whether this kit suits your frame, drivetrain, or rotor setup, get in touch and we’ll help you confirm fitment before you buy.