Shimano GRX FC-RX820 48/31T 12-Speed 175 mm Hollowtech II Chainset - Black
Shimano GRX FC-RX820 48/31T 12-Speed 175 mm Hollowtech II Chainset - Black - NEW is backordered and will ship as soon as it is back in stock.
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12 Month Full Warranty
12 Month Full Warranty
For added re-assurance all items sold include a 12-month warranty. The 12 months warranty starts from the date of purchase. Read more
60 Day Returns Policy
60 Day Returns Policy
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Brand New: Item is new and unused with possible box damaged/box replaced with item seal removed. Item is otherwise complete with all accessories as you would expect from a new item. 12 months warranty supplied.
Like New (A): Item is new and unused with possible box damaged/box replaced with item seal removed. Item is otherwise complete with all accessories as you would expect from a new item. 12 months warranty supplied.
Excellent (B+): Item may have been purchased and returned as unwanted and as a result will have very slight marks on the casing and possible box damage or replaced box. Item is otherwise complete with all accessories. 12 months warranty supplied.
Excellent (B-): Item may have been purchased and returned as unwanted and as a result will have very slight marks on the casing/screen with possible box damage or replaced box. Item is otherwise complete with all accessories. 12 months warranty supplied.
Very Good (C+): Item is a customer return or ex-display item and as a result may have some noticeable marks on the casing and possible box damage or replaced box. Item is otherwise complete with all accessories. 12 months warranty supplied.
Very Good (C-): Item is a customer return or ex-display item and as a result may have some noticeable marks on the casing/screen and possible box damage or replaced box. Item is otherwise complete with all accessories. 12 months warranty supplied.
Fair (D+): Item is a customer return or ex-display item and as a result may have some significant/noticeable marks on the casing and possible box damage or replaced box. Item is fully tested/working and complete with all accessories. 12 months warranty supplied.
Fair (D-): Item is a customer return or ex-display item and as a result may have some significant/noticeable marks on the casing/screen and possible box damage or replaced box. Item is fully tested/working and complete with all accessories. 12 months warranty supplied.
Shimano GRX FC-RX820 48/31T 12-Speed 175 mm Hollowtech II Chainset ...
Description
Description
The Shimano GRX chainset is purpose-built for gravel riding, combining rugged durability, optimised gearing, and efficient power transfer for mixed-terrain adventures. Designed as part of Shimano's dedicated GRX groupset, it delivers smooth performance across roads, gravel tracks, and challenging off-road routes.
Featuring a 48/31T double chainring configuration, the chainset provides a versatile gear range suitable for steep climbs, fast road sections, and long-distance riding. Shimano's Hollowtech II construction ensures an excellent balance of stiffness, strength, and low weight, helping maximise pedalling efficiency on varied terrain.
Constructed with anodised aluminium crank arms and lightweight aluminium chainrings, the GRX chainset is designed to withstand demanding riding conditions while maintaining reliable drivetrain performance. It is fully compatible with Shimano 12-speed Hyperglide+ chains for smooth and precise shifting.
Key Features
- Designed specifically for gravel riding
- Shimano GRX gravel-focused drivetrain technology
- 48/31T double chainring configuration
- Wide-ranging gearing for mixed terrain
- Hollowtech II construction for efficient power transfer
- Lightweight and durable aluminium construction
- Smooth shifting performance with 12-speed drivetrains
- Compatible with Shimano Hyperglide+ chains
- Suitable for gravel, adventure, endurance, and road cycling
- Four-arm chainring design
Specifications
- Brand: Shimano
- Series: GRX
- Type: Chainset
- Speed Compatibility: 12-Speed
- Chainring Sizes: 48T / 31T
- Crank Length: 175 mm
- Construction: Hollowtech II
- Chain Compatibility: Shimano Hyperglide+ 12-Speed
- Crank Arm Material: Anodised Aluminium
- Chainring Material: Aluminium
- Bolt Circle Diameter (BCD): 110 mm
- Chainring Design: 4-Arm
- Colour: Grey
- Intended Use: Gravel, Adventure, Endurance and Road Cycling
- Model Year: 2026
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