Wide array of options delivers optimal gravel gearing for variety of riders

The SHIMANO FC-RX820-1 crank balances weight savings, optimized efficiency and an array of gearing options that cater to the segmented demands of mixed-terrain riding. By pairing a 10-45T or 10-51T cassette with 40T and 42T chainrings, riders can choose closer gear steps or ultimate range. The FC-RX820-1 comes in 170, 172.5, and 175 mm crank arm lengths, providing an additional level of customization.

FEATURES

Optimal gearing for mixed-terrain riding
10-45T and 10-51T cassette options serve array of riding styles
42T and 40T chainrings available

PRODUCT SPECIFICATIONS

MODEL NO FC-RX820-1
SERIES GRX 12-speed
Color Series color
Average weight 644 (40T) 656 (42T)
Rear speeds 12
Compatible chain HG 12-speed
Chain line (mm) 49.7
P.C.D. (mm) 110
Spider/gear arms 4
Chainring combination 40T, 42T
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