Disc Shimano GRX Di2 ST-RX815 - ST-RX810

The top-of-the-range GRX disc brake set for 11 x 2-speed drivetrains with electronic shift-and-brake levers.

Shimano GRX Di2, the new gravel components in the electronic Di2 version, designed for 11x2-speed drivetrains and cassettes up to 34 teeth. With a 48/31-tooth crankset, the GRX 11x2-speed components offer a very wide gear range for a variety of applications, from gravel and cyclocross to touring. Shimano GRX, the first gravel-specific component family designed equally for fast progress and safe bike handling on loose surfaces, is the result of an intensive and extensive research, testing and development process that incorporated information and feedback from countless riders who are out and about on trails, forest tracks, gravel roads or tarmac. Whether it’s gravel riding in the strictest sense, road bike adventures off-road, bikepacking, commuting or the demands of competitive cyclocross riders: Shimano’s GRX components offer countless options that leave nothing to be desired, from gear ratios and spacing, customisable ergonomics and integrated control of dropper seatposts right through to specific gravel wheelsets with wider rim profiles. The 11-speed road bike cassettes (11x30 to 11-34 teeth) can be used.

Shimano GRX STI R815 shift lever:

The GRX Di2 STI hydraulic disc shift/brake levers ST-R815. Extremely fast and precise with larger shift buttons. Thanks to electronic transmission of shift commands, these are executed without delay. Operation is similar to that of mechanical STI levers; shifting occurs at the touch of a button. The new 11-speed shift levers are also equipped with the programmable Multishift function. The GRX Di2 components are the new benchmark in the gravel and cyclocross sectors. With the electronic STI Disc shift-brake lever ST-R815 Di2, Shimano introduces a very compact shift-brake lever for hydraulic disc brakes and the electronic Di2 shifting systems, marking another milestone in the development of hydraulic disc brake systems for road bikes. The GRX Di2 STI levers offer optimum ergonomics thanks to their adjustable grip width. Thanks to electronic transmission of shift commands, these are executed without delay. Operation is similar to that of mechanical STI levers, with shifting at the touch of a button. The new 11-speed shifters are also equipped with the programmable Multishift function. Shimano’s engineers have succeeded in integrating a mineral oil cylinder, including a complete braking system, into these nevertheless very compact mechanical shift-brake levers. The Dual Control shift/brake levers can be optimally adjusted to the rider via a grip width adjustment and are also very well suited to riders with small hands. The grips feature an anti-slip coating for greater control on constantly changing terrain

Shimano BR RX810 brake caliper:

The BR RX810 road bike disc brake caliper is torsion-resistant and approved for brake discs up to 160 mm. Equipped with brake pads featuring external cooling fins, brake heat is reliably dissipated. These calipers are compatible with all Shimano disc brake levers

Flat Mount Standard:

The new Flat Mount caliper standard for road bike brakes reduces weight and offers a significantly sleeker look. With the Flat Mount standard, the rear brake caliper sits directly on the chainstay; no adapter is required for mounting the brake caliper. The bolts pass through the chainstay from below directly into the brake caliper. A flat adapter is still required on the fork. The adapter is screwed onto the rear of the fork leg, with the brake sitting directly on the adapter.

To operate the Dura Ace Di2 shift levers, the EW-SD50 cable and SM-EW90 junction port for Shimano’s Di2 with Quick Mount battery holder and mounting hardware are also required. The EW-SD50 cable set features connectors for the rear derailleur, front derailleur and battery pack. Additionally, the SM-EW90 cockpit junction port is required for connecting the Dura Ace Di2 STI shift levers.

To use the wireless function, the new BT-DN110 battery and the EW-WU111 Bluetooth module are also required.

Shimano Disc GRX STI ST-R815 Di2 Shift-Brake Levers Technical Specifications:

• 12-speed
• Adjustable grip width Carbon levers
• Compatible with Ultegra and Dura Ace 11-speed Di2 front derailleurs and rear derailleurs
• Equipped with programmable Multishift function
• Recommended brake calipers: BRR9170, BRR785, BRRS785, BRR8070
• Weight: approx. 600 g

Shimano BR RX810 Flat Mount brake caliper Technical data:

• Aluminium brake caliper, flat mount installation
• 2-piston system
• Rensin L03A brake pads
• Recommended brake levers: STR8070, STR9120, STRS685, STR785, STR815
• Weight: approx. 260 g
• Flat Mount standard
• Recommended brake hose: SM-BH90-JK-SSR
• Recommended brake discs: Shimano IceTec SMRT800, SMRT900, SMRT86

Contents of delivery Shimano GRX Di2 disc brake:

• Shimano GRX STI Di2 disc brake lever, front left 2-speed, 10-speed; Shimano GRX brake caliper BR-RX810; brake pads L03A; brake hoses SM-BH90-JK-SSR, length 100 cm; screws and small parts for assembly; 160/140 mm adapter

The brakes are supplied without oil and a bleeding kit. Mineral oil and the bleeding kit (item no. 0431894) are required for installation

Herstellerinformation: SHIMANO INC., 3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan, www.shimano.com | EU contact: Shimano Europe BV, High Tech Campus 92, 5656 AG Eindhoven, The Netherlands, www.shimano.com