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Shimano GRX FC-RX610 1x 12-Speed Crankset 38t
Shimano GRX FC-RX610 1x 12-Speed Crankset 40t
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Shimano GRX FC-RX610 1x 12-Speed Crankset 1
Shimano GRX FC-RX610 1x 12-Speed Crankset 2

Shimano GRX FC-RX610 1x 12-Speed Crankset

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Mfg PartNum:
MSRP: $159.99
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GRX 1x Sets The Bar Higher And Takes Your Gearing Lower

The Shimano GRX FC-RX610 1x 12-Speed Crankset offer gearing options that specifically cater to the demands of gravel riding. Available in four crank arm lengths with highly durable steel chainrings including the traditional 40t and, new for 12-speed, an ultra-low climbing-focused 38t, to pair with 10-45 or 10-51 cassettes.

The Next Generation Of Gravel

With the introduction of Shimano GRX RX820 12-speed mechanical components, SHIMANO continues its legacy of innovation as the originator of gravel-specific components. Rooted in simplicity, reliability, and adventure, the new 12-speed GRX lineup delivers more gearing options along with unrivaled ergonomics so riders get the most out each unpaved adventure, wherever that might be. With a focus on the heart and soul of gravel cycling, Shimano mechanical GRX receives this 12-speed upgrade delivering top-tier performance without an over-the-top price. And since gravel is all about personal expression and freedom to choose how and where to ride, Shimano GRX includes three unique 12-speed mechanical drivetrain personalities to cover the full spectrum of riders and rides.


  • 1x12-speed gearing
  • Crank arm length: 165 mm, 170 mm, 172.5 mm, 175 mm
  • Chainring options: 38T and 40T
  • 815 grams (with 40t chainring)

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.


165mm - 38t

Mfg PartNum: EFCRX6101AXA8 

170mm - 38t

Mfg PartNum: EFCRX6101CXA8 

172.5mm - 38t

Mfg PartNum: EFCRX6101DXA8 

175mm - 38t

Mfg PartNum: EFCRX6101EXA8 

165mm - 40t

Mfg PartNum: EFCRX6101AXB0 

170mm - 40t

Mfg PartNum: EFCRX6101CXB0 

172.5mm - 40t

Mfg PartNum: EFCRX6101DXB0 

175mm - 40t

Mfg PartNum: EFCRX6101EXB0 

Mechanic's Corner

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