Shimano GRX BR-RX820 + ST-RX820 Disc Brake

Shimano GRX disc brake with BR-RX820 brake caliper and ST-RX820 shift/brake lever for gravel use

The Shimano GRX disc brake for gravel use combines the BR-RX820 brake caliper with the mechanical-hydraulic ST-RX820 shift/brake lever. This enables smooth, crisp shifting in the 2x12 or 1x12-speed system. At the same time, it impresses with more braking control on mixed surfaces, whether for off-road adventures or gravel racing. The lever and lever body ergonomics have been specially adapted for the intended application and for flared handlebars. The design takes pressure off the palm for increased comfort. The aluminium lever has a texture to prevent slipping. The reach of the lever can be adjusted with the help of a hex key. The pad engagement point is also adjustable. You also benefit from Shimano Servo Wave technology for a more targeted application and a more efficient use of braking power.
The BR-RX820 flat-mount brake caliper impresses with excellent brake control, improved modulation and faster conversion of inputs. It is built more compactly than its predecessor and has 10% more space for the brake pads, which reduces noise. The simple bleeding process via one-way bleeding is well known. The BR-RX820 is made of lightweight aluminium, has two brake pistons made of synthetic resin and a straight hose connection. The disc brake is supplied with a shift cable, cable housing, brake hose and organic pads with Ice-Tech cooling fins for heat dissipation. Of course, it is also compatible with sintered pads and can be combined with brake rotors from 140 to 180 mm.

Specifications:

Series:

GRX RX820

Application:

Gravel

Gearing:

2x, 12-speed

Shifting System:

mechanical

Type:

hydraulic, 2 pistons

Actuation:

mineral oil

Hose:

SM-BH90-JK-SSR

Hose Length (Front/Rear):

1000 mm / 1700 mm

Technical Information - Shift/Brake Lever:

Brake Lever Material:

aluminium

Lever Body Material:

composite

Clamp Material:

steel

Mount:

clamp (closed)

Reach Adjust:

bolt

Adjustment Options:

reach adjust, contact point

Technical Information - Caliper:

Mount:

flat mount

Pads:

resin with cooling fins

Design:

2-piece

Calliper Material:

aluminium

Piston Material:

resin

Hose Connection:

straight

Compatibility:

Shift/Brake Lever:

Mounting Position:

left for front brake caliper, right for rear brake caliper

Clamp Diameter:

23.8 - 24.2 mm

Front Derailleur:

FD-RX820, FD-R7100

Crank:

FC-RX820-2, FC-RX610-2, FC-R9200, FC-R9200-P, FC-R8100, FC-R8100-P, FC-R7100, FC-RS520

Rear Derailleur:

RD-RX820, RD-RX822*, RD-R7100

Cassette:

CS-R8101-12, CS-R7101-12, CS-HG710-12, CS-M9101-12*, CS-M9100-12*, CS-M8100-12*, CS-M7100-12*, CS-M6100-12*

Chain:

CN-M8100, CN-M9100, CN-M7100, CN-M6100

Additional Brake Lever:

BL-RX812

* only 12-speed (right) with 1x12-speed

Brake Caliper:

Mounting Position:

front wheel

Brake Rotor:

140 mm, 160 mm, 180 mm (recommended: RT-CL800)

Pads:

organic and sintered; with narrow pad shape; standard and Ice Tech brake pads

Features:

Shift/Brake Lever:

• mechanical-hydraulic shift/brake lever (2x or 12-speed) for gravel use
• smooth and defined shifting
• great brake control on mixed terrain
• gravel-specific lever and lever body ergonomics
• design reduces pressure on the palm for more comfort
• reach adjustment (10.9 mm) with 2 mm hex tool
• faster brake contact thanks to Servo Wave
• anti-slip brake lever
• bracket optimised for flared handlebars
• shift cable with polymer coating for low friction
• funnel venting with M7 funnel
• lacquered brake lever

Brake Caliper:

• hydraulic disc brake caliper with flat-mount design for gravel use
• more control through better modulation
• faster initiation of the braking process
• less noise thanks to 10% larger brake pad spacing
• more compact than predecessor model
• simple bleeding process
• 2 pistons made of synthetic resin
• painted
• steel bolts (4 mm)

Technology:

STI Dual Control
Shimano Total Integration (STI) means the combination of braking and shifting functions in one lever, which increases safety when riding. By refining the technology, it became possible to make shifting so smooth at the front and rear that they can be triggered with just one finger. Shimano calls such levers Dual Control Levers (DCL).

Servo Wave
Shimano Servo Wave technology optimises the travel of your brake levers. During the braking process, the brake pads are guided quickly to the brake rotor with very short lever travel. The greater part of the lever travel is reserved for the actual braking force. In this way, you can apply your braking power in a more targeted manner and use it more effectively.

One Way Bleeding
One Way Bleeding is a technique used on Shimano calipers that facilitates brake bleeding. The hose routing has been optimised so that no air bubbles remain in the brake calliper. In combination with the funnel, the brake can be bled cleanly and easily.

Manufacturer Numbers:

Front:

IRX8202DLF6SC100A

Rear:

IRX8202DRRDSC170A

Contents:

• 1 x Shimano GRX BR-RX820 + GRX ST-RX820 disc brake, front or rear
• 1 x Shimano SM-BH90-JK-SSR brake hose, 1000 mm (front) or SM-BH90-JK-SSR 1700 mm (rear)
• 1 x pair Shimano resin brake pads with cooling fins
• 1 x disc brake adapter for front 140/160 + 160/180 mm (only for front)
• 1 x hose connection sets
• 2 x type A caliper bolts (front)
• 2 x caliper bolts for 25 mm frame diameters (rear)
• 1 x shifter cable
• 1 x cable housing (front) or 2 x cable housing (rear)
• ready for installation, filled, bleeding is recommended after installation

Order Together:

• TL-BH61 tool for insert installation

Optional accessories:

• FM to FM SM-MA-R160 D/D brake adapter for 160 mm brake rotors on 140 mm FM frames for rear wheel
• FM to FM SM-MA-R160 D/D brake adapter for 180 mm brake rotors on 160 mm FM frames for rear wheel
• K05S-RX Resin Pads
• L04C-MF Metal Pads w/ Cooling Fins
• Type C bolts for 10/15/20/30/35 mm frame diameter
• Type C2 bolts for 10/15/20/30/35 mm frame diameter