Wide array of options delivers optimal gravel gearing for variety of riders. The SHIMANO FC-RX820-1 chainring 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. 

Features
Optimal gearing for mixed-terrain riding
42T and 40T chainrings available

Specifications
Rear speeds 12
Compatible chain HG 12-speed
Chainring combination 40T, 42T

Mfr Claimed Weight 
TBC