Shimano GRX FC-RX820-2 Hollowtech II Crankset

Shimano GRX FC-RX820-2 crankset - two chainrings for efficiency on any terrain

The Shimano GRX FC-RX820-2 is a lightweight, very efficient 2x12-speed crank for ambitious gravel rides as well as for aggressive gravel races. The set-up with two chainrings is suitable for all those who want to combine the flexibility of conventional road bike gears with off-road capability. The gear ratio has been chosen so that you can always pedal smoothly. You are fast on the flat and make good progress on climbs, no matter what the terrain is like. Even when riding in a group, you will find the right gear with the FC-RX820. The crank features the proven Hollowtech II design for highly efficient power transmission and outstanding stiffness with the lowest possible weight. One reason for this is that the crank arms are hollow and, like the chainrings, made of lightweight aluminium. The model has a specific bolt circle diameter of 80 and 110 mm. It produces a chainline of 47 mm and a Q-factor of 151 mm, which is a difference of about +3 mm compared to road bike cranks.

Specifications:

Application:

Gravel

Compatibility:

Shimano 2x12-speed

Chainring Mount:

110/80 mm bolt circle diameter, 4-arm asymmetrical

Technical Information:

Series:

GRX RX820

Crank Arm Material:

aluminium

Chainring Material:

aluminium

Axle Material:

steel

Gradation:

31-48 T

Crank Arm Length:

170.0 mm, 172.5 mm, 175.0 mm

Chainline:

47 mm

Q-Factor:

151 mm

Axle Diameter:

24 mm

Compatible BSA Shell Width:

68 mm

Recommended Bottom Bracket:

SM-BBR60 or SM-BB72-41B Press Fit Hollowtech II (not included)

Recommended Chain:

HG 12-speed (e.g. CN-M8100)

Compatibility:

Shift/Brake Lever:

ST-RX820, ST-RX610, ST-R7120

Front Derailleur:

FD-RX820

Bottom Bracket:

BB-R9100, SM-BB9000, SM-BBR60, SM-BB6700, SM-BB5700, BB-RS501, BB-RS500, SM-BB4600, SM-BB92-41B, SM-BB72-41B, SM-BB71-41B, BB-RS500-PB

Chain:

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

Features:

• 2x12-speed aluminium crank for gravel use
• optimised for mixed terrain and different riding styles
• gear ratio helps to maintain a steady pedalling rhythm even on rough surfaces
• perfect gradation also for riding in a group
• generous 17-tooth difference between chainrings for changing conditions
• Hollowtech II: perfect balance between stiffness, stability, weight and rotational efficiency
• hollow crank arms (Hollowtech)
• anodised crank arms and chainrings
• aluminium chainring bolts

Technology:

Hollowtech II
Shimano Hollowtech II is a crank bottom bracket system designed to achieve an ideal ratio of stiffness, weight and rotational efficiency. It is based on an integration of the bottom bracket and the right crank arm and works with a 24 mm axle or bearing diameter, which has proven to be optimal in terms of stability. In many cases, the bearing cups are on the outside so that the load is better distributed. High-quality precision seals ensure a long service life.

Manufacturer Numbers:

170.0 mm 31-48:

IFCRX8202CX81

172.5 mm 31-48:

IFCRX8202DX81

175.0 mm 31-48:

IFCRX8202EX81

Contents:

• 1 x Shimano GRX FC-RX820-2 crankset (31-48 tooth)
• 1 x Shimano crank bolts