Shimano GRX FC-RX820-2 Chainring - 31t Inner Ring 80 BCD For 2x 12-Speed BLK Standard 70 - Vivid C1+ (2024+) Additionally their 6V3W rating ensures

Additionally their 6V3W rating ensures compatibility with standard hub dynamo products including dynamo lamps and converters for USB powered devices Front Axle 12mm Thru x 100mm Color Black Bearing Type Sealed Cartridge Defined Color Black Spoke Interface Straight Pull Hub Drilling 24 Hub/Brake Compatibility Center-Lock Disc

25" Material Chromoly Steel Maximum Wheel Size (in) 27 Disc Brake Compatible No

The myriad combinations available can make this seem complicated

Well suited for use on or off road

Weight: 50 grams

Shimano GRX FC-RX820-2 Chainring - 31t Inner Ring 80 BCD For 2x 12-Speed BLK Standard 70 - Vivid C1+ (2024+) Additionally their 6V3W rating ensuresThese Shimano GRX RX820 2 anodized aluminum chainrings are for specifically designed for use with GRX FC RX820 2 2x 12 speed cranksets. Ring Position Type Inner Tooth Count 31 Drivetrain Speeds 12 Round or Oval Round Chainring BCD 80 Material Aluminum Color Black Weight 40 Defined Color Black Number of Bolt Holes 4 Bolt