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Shimano GRX RX820 1x Crankset
August 12, 2025$224.99
1x Shimano 12-speed crankset for your gravel or cyclocross bike
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Shimano GRX RX820 1x Crankset
The Shimano GRX RX820 1x Crankset is Shimano’s latest 12-speed crankset for your gravel or cyclocross bike. This 1x crankset is available with both 40T and 42T chainring options. These single chainring gearing options allow you to find the perfect gear for your riding while also removing the need for a front derailleur. Additionally, the RX820 can be combined with any of Shimano’s GRX 610-series components.
Key Product Details
Compatibility:
This Shimano GRX 12-speed crankset is compatible with Shimano 24 mm bottom brackets and 12-speed groupsets.
Key Features:
Shimano’s latest 1x crankset, ideally suited gearing for gravel riding, can also be used with 1x or 2x GRX chainrings. See Specs tab for more details.
Advice From Our Staff:
Shimano GRX cranksets are one of the most popular options for gravel and CX riders. This new 820 series is a great crankset for riders looking for a 1x setup for their 12-speed Shimano drivetrain.
Options For This Crankset
- Chainrings: 40 | 42
- Crank arm lengths: 170 mm | 172.5 mm | 175 mm
Other Versions to Consider
Shimano GRX RX820 2x Crankset: If you are looking for a 2x crankset, we have the Shimano GRX RX820 2x Crankset. This version provides extra range for rolling terrain or steep climbs.
Compatibility
This crankset is compatible with Shimano 24 mm bottom brackets and 12-speed groupsets.
Specs
- Interface: 110/80 BCD 4-Bolt
- Crank Arm Material: Aluminum
- Chainrings: 1x (however you can put 2x rings on it as well)
- Speeds: 12
- Spindle Size: 24 mm
- Chainline: 49.7 mm
- Q-factor: 151 mm
- Weight: 40T - 644 grams | 42T - 656 grams
Tools Needed for Installation
You will need the following tools for installation of this product. You can shop for the required tools on our Tools Page.
- Shimano Crank Arm Cap Tool
- 5 mm Allen key
Q&A
Have a question about this? Ask the staff.
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THIS PRODUCT IS FREQUENTLY BOUGHT WITH
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Wolf Tooth WT-1 Chain Lube$18.95Premium synthetic chain lubricant plus a drivetrain treatment in one bottle! -
Shimano Ultegra/XT-level chain. Compatible with all 12-speed road and MTB drivetrains including e-Bikes -
For the instillation or removal of Shimano Hollowtech II cranks -
Wolf Tooth Aero Shimano 12-Speed GRX ChainringPrice range: $124.95 through $150.95Aero Wolf Tooth Drop-Stop ST chainrings for your Shimano 12-speed GRX crankset
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