Shimano GRX FC-RX820 12 Speed Double Chainset - 48/31T - 175mm

Designed for modern gravel riding, the Shimano GRX FC-RX820 2x12-speed chainset delivers the perfect balance of speed, efficiency and control across mixed terrain. Featuring a wide-range 48/31T gearing combination, it offers higher top-end speed for fast road sections while maintaining low climbing gears for steep gravel ascents and loaded bikepacking adventures.

The FC-RX820 utilises Shimano's Hollowtech II construction for an excellent strength-to-weight ratio, providing efficient power transfer and long-term durability. Its wider chainline improves tyre and frame clearance, making it ideal for modern gravel bikes running wider tyres.

Optimised for Shimano's 12-speed GRX drivetrain, the FC-RX820 delivers smooth front shifting performance and reliable chain retention whether you're riding tarmac, gravel tracks or challenging off-road routes.

Features:
- Shimano GRX RX820 gravel-specific double chainset
- Optimised for 12-speed drivetrains
- 48/31T chainring combination for a wide gear range
- Hollowtech II forged aluminium crank construction
- Gravel-specific wider chainline for increased tyre clearance
- Smooth and precise front shifting performance
- Excellent power transfer and durability
- Suitable for gravel riding, adventure cycling and bikepacking

Specifications:
- Series: Shimano GRX RX820
- Model: FC-RX820-2
- Speed: 12-Speed
- Chainring Combination: 48/31T
- Crank Arm Lengths: 160mm, 165mm, 170mm, 172.5mm & 175mm
- BCD: 110/80mm 4-arm asymmetric
- Chainline: 47mm
- Q-Factor: 151mm
- Rear Compatibility: 12-speed road/gravel
- Recommended Chain: Shimano HG 12-speed chain
- 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 & chainrings
- Weight: Approx. 710g (172.5mm, manufacturer claimed)