Shimano GRX BL-RX825 / BR-RX820 Disc Brake - STI | Flat Mount | J-Kit - left (L) | front (F)

GRX Di2 – Gravel Goes Wireless.

With components specifically designed for 1x12-speed drivetrain systems, the GRX series is celebrating its debut in the completely wireless shifting segment. The focus is on the RD-RX827 rear derailleur, which is based on the wireless models of the XTR M9250 series. The 1-speed concept is complemented by the BL-RX825 brake lever and the WH-RX810 wheels. Equipped like this, gravel athletes can experience what ultimate reliability means on any terrain – whether racing, back-roading on remote trails or on your next all-day adventure.

Shimano GRX disc brake set consisting of the BL-RX825 lever and the hydraulic BR-RX820 caliper. Smooth and simple maintenance is ensured by the proven One Way Bleeding system and the Easy Hose Joint System which makes brake hose replacement considerably easier.

Shimano GRX BL-RX825-L brake lever

The hydraulic disc brake lever complements the wireless line-up of the GRX series, which was introduced with the RD-RX827 rear derailleur and is tailored to 1x12-speed drivetrains. Designed purely for deceleration, the brake lever for drop bar handlebars dispenses with electronic shift buttons, saving 19.5 grams compared to the Dual Control equivalent. Apart from that, it offers the same ergonomic advantages as the ST-RX825 brake/shift levers, including raised hoods, ribbed surfaces and a non-slip lever blade. Like its counterpart with shifting function, its design is particularly suitable for flared Gravel handlebars featuring Flare.

Shimano GRX BR-RX820-F disc brake caliper

The GRX BR-RX820 hydraulic caliper stands for superior braking power in difficult terrain. Thanks to improved dosing and a faster-gripping pressure point, Gravel bikers experience a completely new feeling of control. In addition, the Flatmount disc brake caliper is quieter and easier to maintain than ever before, despite its flatter design. While a 10 % increase in brake pad spacing reduces noise, the proven One Way Bleeding system makes servicing easier.

SERVO WAVE | Because the brake lever absorbs a lot of brake travel right at the beginning of its movement, the brake pads come into contact with the brake disc more quickly and more lever travel remains for modulating the braking force. Accordingly, SERVOWAVE brake systems are characterized by faster response, higher performance and shorter idle travel.

J-Kit (Easy Hose Joint System) | For brake systems with J-Kit brake hose connection, the brake lever has an integrated squeeze seal (olive), which makes the installation and removal of the brake line much easier overall.

Ice Technologies | In order to keep the braking power at longer continuous operation consistently high, Shimano has developed the Ice-Tech cooling technology for brake discs and brake pads. Brake pads with Ice Technologies feature cooling fins made of aluminum, which better dissipate heat. In conjunction with the optimized radiation properties of the rotor, this results in a longer durability of the pads, while brake noise and fading are minimized.

Scope of supply:

brake lever + brake caliper (set, filled and bled), incl. brake pads (resin with cooling fins) and brake hose (SM-BH90-JK-SSR, 1000 mm)