Shimano GRX FC-RX820 12 Speed Gravel 1x Chainset - 42T - 172.5mm

Built for riders who value simplicity, reliability and maximum chain security, the Shimano GRX FC-RX820 1x12-speed chainset is designed specifically for gravel racing, adventure riding and mixed-terrain exploration. Featuring Shimano's dedicated 1x drivetrain technology, it delivers efficient power transfer and outstanding chain retention over rough surfaces.

Available with a range of direct-mount chainring options, the FC-RX820 offers the flexibility to tailor gearing to your riding style, whether you're racing fast gravel events or tackling demanding bikepacking routes. The wider gravel-specific chainline provides increased tyre and frame clearance while maintaining optimal drivetrain efficiency.

Constructed using Shimano's proven Hollowtech II technology, the FC-RX820 combines lightweight performance with exceptional stiffness and durability for confident riding in all conditions.

Features:
- Shimano GRX RX820 gravel-specific 1x chainset
- Optimised for Shimano 12-speed drivetrains
- Available with multiple chainring sizes to suit different riding styles
- Dynamic Chain Engagement+ tooth profile for improved chain retention
- Hollowtech II forged aluminium crank construction
- Gravel-specific wider chainline for increased tyre clearance
- Excellent stiffness-to-weight ratio
- Ideal for gravel racing, adventure riding and bikepacking

Specifications:
- Series: Shimano GRX RX820
- Model: FC-RX820-1
- Speed: 12-Speed
- Chainring Sizes: 40T, 42T, 44T & 46T
- Crank Arm Lengths: 160mm, 165mm, 170mm, 172.5mm & 175mm
- Chainline: 50mm
- Q-Factor: 151mm
- Rear Compatibility: Shimano 12-speed road/gravel drivetrains
- Chainring Mount: Shimano Direct Mount
- Chain Retention: Dynamic Chain Engagement+
- Crank Construction: Hollowtech II
- Axle Type: Integrated 24mm Hollowtech II axle
- Recommended Bottom Bracket - Road Frame Threaded - SM-BBR60 or BB-RS501
- Recommended Bottom Bracket - Road Frame PressFit BB86/BB92 - SM-BB72-41B
- Bottom Bracket Shell Width: 68mm (BSA Road) or 86.5mm (PressFit BB86)
- Material: Aluminium crank arms with aluminium direct-mount chainring
- Weight: Approx. 655g (40T, 172.5mm, manufacturer claimed)