Shimano Ultegra FC-R8100 Crankset - 165mm | 52/36t

Shimano Ultegra FC-R8100 Crankset - 165mm | 52/36t Shimano

Shimano Ultegra FC-R8100 Crankset - 165mm | 52/36t

Shimano Ultegra FC-R8100 Crankset - 165mm | 52/36t

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Who Should Choose the Shimano Ultegra FC-R8100 165mm Crankset?

The Shimano Ultegra FC-R8100 in 165mm arm length is the same 12-speed road crankset built on Hollowtech II with hollow forged crank arms and a Hollowglide outer chainring -- the key difference is the shorter 165mm arm length that Shimano introduced for the R8100 generation to serve smaller riders, triathletes, and cyclists who have moved to shorter cranks for biomechanical or comfort reasons. Shorter arms reduce the arc the knee traces through each pedal stroke, which can decrease knee stress and allow a higher cadence more naturally for riders whose fit calls for it. The shifting performance, stiffness-to-weight ratio, and drivetrain efficiency are identical to longer arm versions.

52/36t chainring configuration, 2x12-speed, Hollowtech II 24mm axle. Compatible with Shimano 12-speed road derailleurs (Ultegra R8100, Dura-Ace R9200) and requires a compatible 12-speed Shimano road bottom bracket. Chainrings are replaceable separately. If your bike fit analysis or saddle-to-pedal calculation puts you in the shorter arm range, the 165mm FC-R8100 delivers full Ultegra 12-speed performance at the right length.

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Specifications

  • Model: FC-R8100
  • Series: Shimano Ultegra
  • Speed: 2x12-speed
  • Arm Length: 165mm
  • Chainrings: 52/36t
  • Interface: Hollowtech II (24mm axle)
  • Compatible BB: SM-BBR60 (threaded), SM-BB72-41B (press-fit)
  • Compatible Derailleurs: Shimano 12-speed road (Ultegra R8100, Dura-Ace R9200)

FAQ

Who benefits most from 165mm crank arms?

Shorter cranks suit riders with a shorter inseam, those with hip flexor limitations, triathletes in an aggressive aero position, or anyone whose bike fit has identified shorter arms as optimal. The trend toward shorter cranks in professional cycling has also prompted many club riders to experiment with the shorter lengths.

Is the performance of the 165mm crankset any different from the 170mm version?

The shifting performance, stiffness, and power transfer are identical. Arm length is a fit variable, not a performance variable. Some riders find shorter arms allow a more comfortable position and higher cadence, which can translate to better performance for them individually.

Can I swap chainrings to a 50/34t compact configuration?

Yes. The chainrings on the FC-R8100 are user-replaceable. Shimano offers the R8100 series in 50/34t compact and 54/40t configurations as separate chainring sets.

Best For

Smaller riders, triathletes, and cyclists whose bike fit specifies a 165mm arm length who want full Ultegra 12-speed performance in a Hollowtech II crankset.

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