Specifications
As listed in the manufacturer's catalog.
General
- Series
- GRX
- Model no.
- FC-RX820-2
- Color / 1
- Series color
- Rear speeds
- 12
- Compatible chain
- HG 12-speed
- Chain line (mm)
- 47
- P.C.D. (mm)
- 110/80
- Spider/gear arms
- 4
- Chainring combination
- 48-31T
- Q-factor (mm)
- 151
- Optional chain guard / Without chain/bash guard
- Yes
- HOLLOWTECH II
- Yes
- Compatible bottom bracket type / Outboard
- Yes
- Crank fixing screw included
- Yes
- Average weight (g) (170 mm, w/o bottom bracket)
- 718
Crank arm length (mm)
- 160
- Yes
- 165
- Yes
- 170
- Yes
- 172.5
- Yes
- 175
- Yes
Recommended bottom bracket
- Threaded (normal)
- SM-BBR60
- Press-Fit
- SM-BB72
Threaded bottom bracket shell width (mm)
- 68
- Yes
- 70
- Yes
Crank arm
- Material
- Aluminum
- Finish
- Anodized
Crank axle
- Material
- Steel
- Finish
- Plated
Outer ring
- Material
- Aluminum
- Finish
- Anodized
Inner ring
- Material
- Aluminum
- Finish
- Anodized
Outer/middle ring fixing bolt
- Material
- Aluminum
- Finish
- Anodized
How spec sheets write it
The most common ways bicycle spec sheets name it, by number of mentions.
-
GRX RX820-2 2x12 Chainset-170mm - 48-31T
-
Shimano GRX 820 2x12-SPD CRANKSET
-
Shimano GRX FC-RX820-2, 48-31 teeth, crank length: 170 mm or 175 mm depending on frame size, Q-factor: 151 mm, lightweight and stiff thanks to HOLLOWTECH II design, wide gear range
-
Shimano GRX, FC-RX820-2, 48/31t
-
Shimano GRX FC-RX820-2, 48-31 teeth, crank length: 170 mm or 175 mm, depending on frame height, Q-factor: 151 mm, light and stiff thanks to HOLLOWTECH II design, large gear range
-
Shimano GRX FC-RX820-2, Number of chainrings: 2
-
Shimano 4iiii FC-RX820-2 170mm, 31-48
-
Shimano GRX FC-RX820-2, Hollowtech II, 48x31T, 4iiii Precision 3+ Powermeter one side
Bicycles
Published bicycles that use it, newest model years first.
