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.

Features
Riders can choose closer gear steps or ultimate range depending on personal need by pairing a 10-45t or 10-51t cassette with 40t or 42t chainring (cassettes and 42t chainring sold separately)
Optimal gearing for mixed-terrain riding
Hollowtech II crank arms provide strength and stiffness with the benefit of weight savings

Specifications
49.7mm chainline
151mm Q-factor
Number of Chainrings: Single
Rings: 40T or 42T
Chainline/Hub Compatibility: 135/142 Road Disc Hubs > 415 mm Chainstay
Pedal Spindle: 9/16"
Crank Intended Use: Gravel
Spindle Interface Type: Shimano Hollowtech II
Drivetrain Speeds: 12
Chainring BCD: 110 Shimano Asymmetric
BB Included: No (sold separately)
Color: Black

Mfr Claimed Weight 
644g (40T) 656g (42T)