Disc Shimano GRX ST-RX810 / BRRX810

The GRX disc brake with a left-hand brake lever for operating dropper seatposts with a 2-step mechanism

Shimano BL RX810 disc lever:

With the BL-RX810 disc brake lever, Shimano offers a very compact brake lever for hydraulic disc brakes and 11x1 drivetrains. The left lever has no shifting function. Ergonomics specially adapted for gravel riding are characterised by a pivot point on the brake lever that is 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 the technology of the Ultegra series, but without the shifting mechanism. Shimano’s engineers have succeeded in integrating a mineral oil cylinder, including the complete braking system, into these disc brake levers, which remain very compact. The brake levers are made of aluminium; this technology guarantees maximum stiffness, durability and a robust design.

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 brake calipers are compatible with all Shimano disc brake levers

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.

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 GRX Disc Brake Lever ST RX810LA Technical Specifications:

• Adjustable reach
• 2-stage shifting mechanism for dropper seatposts
• With cable guide for dropper seatposts
• 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 BR RX810 Flat Mount brake caliper Technical data:

• Aluminium brake caliper, flat mount
• 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 Shimano GRX disc brake set:

Shimano GRX disc brake lever BLRX810RX, left-hand, for seatposts, Shimano GRX brake caliper BR-RX810 Flat Mount, brake pads L03A, Brake hose SM-BH90-JK-SSR, length 100cm, screws and 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