Shimano GRX FC-RX820-2 2x12 speed Crank 48/31T

Shimano GRX FC-RX820-2 2x12-speed Crank 48/31T
The new GRX FC-RX820-2 HOLLOWTECH II 2 x 12-speed crankset offers the perfect synthesis of light weight and high efficiency for mixed terrain riding. The transmission options address the specific requirements of Gravel and provide tighter graduations for a smooth rhythm.
For your riding freedom: the Gravel GRX 2x12-speed FC-RX820-2 Crank 48/31T from Shimano
The SHIMANO FC-RX820-2 balances weight savings and optimal efficiency for mixed-terrain riding and racing. Double chainring gearing caters to the segmented demands of gravel cycling, maintaining the tighter gear steps needed to maintain your position in the bunch. The 2 x 12-speed crank utilizes a 48-31T chainring and comes in 170, 172.5, and 175mm crank arm lengths.
Gravel cycling is not meant to be overly complicated. The heart and soul of cycling’s drop bar, dirt road discipline is rooted in simplicity, inclusivity, and adventure. No ride is out of bounds. All are welcome to join. Gear should be functional and reliable but need not break the bank. That’s why whether you’re a grizzled gravel cycling veteran or brand new to the road (or trail) less traveled, you’ll appreciate the latest iteration of Shimano’s groundbreaking—and industry-first-gravel-specific GRX component group. Designed to help you get the most from your next unpaved adventure, RX820 delivers top-tier performance without an over-the-top price.

For riders seeking the best of both worlds, the new 2x12 RX820 UNDROPPABLE drivetrain is the choice. Utilizing a gravel-optimized 48/31 front chainring paired with an 11-34 or 11-36 cassette, this setup delivers an ultra-wide gear range so you can spin a comfortable cadence whether cruising the flats, smashing endless dirt road rollers, or tackling a massive backcountry climb.

This setup delivers precise mechanical shifting both front and rear and an integrated SHADOW PLUS chain stabilization for ultimate security over bumpy terrain. The gravel-specific 2x12 option maintains tighter rear cassette gear steps, ideal for subtle cadence changes during competitive racing and spirited weekend group rides. And the 2x12 setup seamlessly interfaces with most existing 700c wheels thanks to its use of the tried-and-true HG freehub body design.

Features - Shimano GRX FC-RX820-2-12 | 2x12-speed Crank | 48/31
Gravel gear ratios preserve riding rhythm over rough surfaces with wider tires
Optimum gearing for mixed terrains and riding styles
Wider range front system
17T range covers array of riding conditions
Product features
Use: Gravel, Cyclocross
Group: GRX
Model: FC-RX820-2
Gradation: 48/31T
Q-Factor: 151mm
Threaded BB shell width: 68 / 70mm
Gear front: 2-speed 
Gear rear: 12-speed
Construction: Hollowtech II
Compatible Chain: 12-speed HG
PCD: 110/80mm
Chain line: 47mm
Recommended BB Pressfit: SM-BB72
Recommended BB BSA: SM-BBR60
Crank arm length (choose variant)
172.5mm
175mm
Material
Crank arm: Aluminum Anodized
Crank axle: Steel Plated
Chainrings: Aluminum Anodized
Color
Series color
Weight
approx. 721g/172.5mm (manufacturer information)
Scope of delivery
1 x Shimano GRX 2x12-speed Crankset FC-RX820 48/31T
Bottom Bracket BSM-BBR60 BSA / Pressfit SM-BB72 not included!
Technologies
HOLLOWTECH II - Providing the best balance of stiffness, strength, weight and rotating performance
The concept of HOLLOWTECH II technology is focused on producing a superior crankset which will maximize a rider’s power transfer. The rigidity of the crankset ensures pedaling efficiency while its weight, a key element of the crankset, you want light, aids in cycling longer distances over which the rider needs to pedal more. Naturally, SHIMANO strove for the optimum balance between the conflicting needs of stiffness while producing a lightweight crank. HOLLOWTECH technology is an ultra-lightweight hollow crankarm created by SHIMANO with the company’s own proprietary forging technology that also maintains rigidity. The addition of HOLLOWTECH II technology integrates the bottom bracket axle with the right crankarm for more stiffness and a weight savings to achieve a high-dimensional balance. Its outboard bottom bracket bearing system provides better weight distribution and more pedaling stability, allowing for more efficient power transfer.