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
✔
Specifications
Size
40x170mm 12-Spd or
40x172.5mm 12-Spd or
42x170mm 12-Spd or
42x172.5mm 12-Spd
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