Is the Shimano Ultegra FC-R8100 170mm the Right Crankset for You?

The Shimano Ultegra FC-R8100 is the 12-speed road crankset that brings Dura-Ace-level shifting refinement to a broader range of cyclists, built on Hollowtech II with hollow forged crank arms that Shimano engineers for the optimal balance of stiffness, weight, and rotational performance. The outer chainring uses a Hollowglide hollow structure that cuts weight while maintaining rigidity for quicker and more precise front shifting -- a real-world improvement that riders notice immediately in the cleanliness of front shifts across the full 12-speed cassette range. The 170mm arm length and 52/36t chainring combination covers the most common setup for road cyclists running a compact-adjacent gearing with a wide-range cassette.

The FC-R8100 requires a compatible 12-speed Shimano road bottom bracket (SM-BBR60 for threaded, SM-BB72-41B for press-fit) and is compatible with Shimano Ultegra R8100 and Dura-Ace R9200 Di2 front derailleurs and 12-speed rear derailleurs. Available in arm lengths from 160mm through 175mm and in multiple chainring configurations including 50/34, 52/36, and 54/40t. Chainrings are replaceable separately when worn. A straightforward choice for the rider who wants Shimano's best 12-speed shifting performance at a more accessible investment than Dura-Ace.