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An integral part of Shimano's 12-speed road lineup, the FC-R8100 crank builds upon legendary front shifting and transmission efficiency.
An integral part of Shimano's 12-speed road lineup, the FC-R8100 crank builds upon legendary front shifting and transmission efficiency.
Shimano

Shimano FC-R8100 Ultegra 2x12s 50-34 175mm Crankset in Black

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Shimano FC-R8100 Ultegra 2x12s 50-34 175mm Crankset in Black

Season:2026

Brand:Shimano

Code:IFCR8100EX04

An integral part of Shimano's 12-speed road lineup, the FC-R8100 crank builds upon legendary front shifting and transmission efficiency.

With new refinements for seamless 12-speed shifting, the Ultegra crank brings performance and improved fit for smaller riders, triathletes, and riders with specific biomechanical requirements.

The HOLLOWTECH II technology focuses on producing a superior crankset to maximize power transfer. The rigidity of the crankset ensures pedaling efficiency, while its lightweight design aids in cycling longer distances. The HOLLOWTECH II technology integrates the bottom bracket axle with the right crankarm for more stiffness and weight savings. Its outboard bottom bracket bearing system provides better weight distribution and more pedaling stability, allowing for more efficient power transfer.

The HOLLOWTECH crank arm is hollow forged to provide strength and rigidity at a very lightweight, reducing rotating mass to aid in acceleration.

Features:

  • Optimal balance of stiffness, strength, weight and rotational performance.
  • HOLLOWGLIDE structure cuts weight yet maintains strength for better power transfer and quicker, more precise front shifting.
  • Hollow forged crank arms reduce rotating mass to aid in acceleration.
Technical Information
  • Series
    ULTEGRA
  • Rear speeds
    12
  • Compatible chain
    HG 12-speed
  • Chain line (mm)
    44.5
  • P.C.D. (mm)
    110
  • Spider/gear arms
    4
  • Chainring combination
    46-36T, 50-34T, 52-36T
  • Q-factor (mm)
    148
  • Crank arm length (mm)
    160, 165, 170, 172.5, 175
  • Optional chain guard
    Without chain/bash guard
  • Technologies
    HOLLOWTECH II, HOLLOWTECH crank arm, HOLLOWGLIDE
  • Compatible bottom bracket type
    Outboard
  • Recommended bottom bracket
    Threaded (normal) SM-BBR60, Press-Fit SM-BB72-41B
  • Threaded bottom bracket shell width (mm)
    68, 70
  • Crank fixing screw included
    Yes
  • Average weight
    702g (46-36T), 700g (50-34T), 711g (52-36T)
Sizing Information
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