Optimal gearing for spirited group rides and aggressive racing
The SHIMANO FC-RX820-2 balances weight savings and optimal efficiency for mixed-terrain riding and racing. Double chainring gearing caters to the segmented demands of gravel cycling, maintaining the tighter gear steps needed to maintain your position in the bunch. The 2x12-speed crank utilizes a 48-31T chainring and comes in 170, 172.5, and 175 mm crank arm lengths.
FEATURES
Smaller gear steps for cadence control on mixed-terrain riding
Gravel-optimized gear ratios preserve riding rhythm on rough surfaces
Wider gear range
17T range covers array of riding conditions
Gear combination: 48-31T
PRODUCT SPECIFICATIONS
MODEL NO
FC-RX820-2
SERIES
GRX 12-speed
Color
Series color
Average weight
710
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
Crank arm length (mm)|170
✔
Crank arm length (mm)|172.5
✔
Crank arm length (mm)|175
✔
Optional chain guard|Without chain/bash guard
✔
HOLLOWTECH II
✔
HOLLOWTECH crank arm
✔
Compatible bottom bracket type|Outboard
✔
Recommended bottom bracket|Threaded (normal)
SM-BBR60
Recommended bottom bracket|Press-Fit
SM-BB72
Threaded bottom bracket shell width (mm)|68
✔
Threaded bottom bracket shell width (mm)|70
✔
Crank fixing screw included
✔
Specifications
Size
48x31x170mm 12-Spd or
48x31x172.5mm 12-Spd
Tags
Tags
Chainwheel Gravel SHIMANO GRX FC-RX820-2 w/o B.B. Parts Ind. Pack
