Disc Shimano GRX ST RX 810 / BR RX 810

The top-of-the-range GRX disc brakes for 11 x 2-speed drivetrains, based on Shimano Ultegra technology

Shimano GRX, the new gravel components designed for 11-speed drivetrains and cassettes up to 42 teeth. With the new 48/31-tooth crankset, the GRX components offer a 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. Either the 11-speed road or 11-speed MTB cassettes can be used.

Shimano STI ST-RX810 Disc Lever:

With the STI Disc ST-RX810 shift-brake lever, Shimano introduces a very compact shift-brake lever for hydraulic disc brakes and mechanical shifting systems. Ergonomics specially adapted for gravel riding are characterised by a brake lever pivot point raised by 18 mm, a curved lever shape and non-slip textures on the contact surfaces, ensuring optimum grip even on the roughest terrain. These disc brake levers are based on Ultegra STI technology and are compatible with Shimano’s mechanical Dura-Ace 9000, Ultegra 7000 and 105 7000 11-speed groupsets. 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 brake levers are made from aluminium; this technology guarantees maximum stiffness, durability and a robust design. Thanks to the improved positioning of the brake cable, a smooth braking action is achieved, leading to optimised control in extreme conditions. The Dual Control shift/brake levers can be optimally adjusted to the rider via a grip width adjustment and are also very well suited for riders with small hands. Shifting can be performed much faster with the new shift levers. This is achieved through a 20 per cent shorter cable. The grip sections feature an ergonomic design for improved comfort – even over long distances. The GRX STI levers can be combined with the BLRX812 auxiliary brake levers. These are mounted between the shift levers and the brake on the top tube, just like classic cross-country brake levers. This ensures full control over the bike in every riding situation.

Shimano BR-RX810 disc brake caliper:

The BR-RX810 road bike disc brake caliper is torsionally rigid 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. Recommended brake discs: SM-RT800, SM-RT86

Flat Mount Standard:

The Flat Mount caliper standard for road bike brakes reduces weight and offers a significantly sleeker look. 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. This adapter is suitable for 140 and 160 mm discs; it is simply turned over for the larger size.

With the Flat Mount Standard, the rear brake caliper sits directly on the chainstay; with 140 mm brake discs, no adapter is required to mount the brake caliper. The bolts then pass through the chainstay from below directly into the brake caliper. For 160 mm discs, the SMMAR160 adapter is required. To mount the brake calipers on the frame, additional bolts are required, which are screwed through the rear stay. These are available in different lengths to suit rear stays of varying thicknesses.

Shimano Disc STI ST-RX810 Shift-Brake Lever Technical Specifications:

• 2-speed
• Adjustable grip width
• Effortless shifting; the release lever is now even easier to operate
• Short shift travel; the lever travel required for downshifting has been reduced by 10 mm
• SIS-SP41 shift cable housing: The silicone grease reduces the friction resistance of the cable housing by 10 per cent
• Compatible with GRX 105, Ultegra and Dura-Ace 11-speed front derailleurs and rear derailleurs
• Includes inner cables
• Compatible oil: Shimano mineral oil, item no. Y83998010
• Recommended for bleeding: Item No. SMDISCBP
• Recommended brake calipers: BRRX810, BRRX400, BRR8070, BRRS785
• Weight: approx. 555 g

Shimano BRRX810 Flat Mount brake caliper Technical data:

• Aluminium brake caliper, flat mount installation
• 2-piston system
• Rensin L03A brake pads
• Recommended brake levers: STRX600, STR8020, STR785
• Weight: approx. 143 g
• Flat Mount standard
• Recommended brake hose: SM-BH-90-JK-SSR
• Recommended brake discs: Shimano IceTec SM-RT64, SM-RT800, SMRT67, SMRT66, SMRT86, SMRT81, SMRT99

Included in delivery:

• Shimano GRX STI Disc shift/brake lever STRX810, front left, 2-speed, Shimano BRRX810 brake caliper, L03A brake pads, 100 mm brake hose, small parts for assembly, 160/140 mm adapter, without oil

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