Tap into superior drivetrain performance with the Shimano ULTEGRA FC-R8100 crankset, a cornerstone of Shimanos latest 12-speed road groupset. Built with advanced materials and design, this crankset strikes the ideal balance of stiffness, strength and weight translating your effort into forward motion with precision.

Performance & Fit

Whether you’re a smallerstature rider, a triathlete chasing aerodynamic advantage or a dedicated road athlete wanting the best fit and feel, the FC-R8100 offers crank arm lengths from 160, 165, 170, 172.5 to 175 mm. Having this flexibility ensures optimal biomechanics, more efficient pedalling and less risk of fatigue.

Drivetrain Compatibility

Designed for 212-speed road setups, the crankset supports chainring options of 52-36, 50-34 and 46-36 allowing you to tailor your gearing for climbing, flat courses or triathlon time-trials.

Advanced Technology

At the heart of the FC-R8100s performance is Shimanos HOLLOWTECH II architecture: hollow-forged crank arms and an integrated bottom bracket axle that enhance stiffness and reduce weight, while maintaining ultra-precise front shifting. The HOLLOWGLIDE structure on the outer chainring improves rigidity and shifting speed delivering crisp, reliable shifts when you demand it most.

Why It Matters

In road and triathlon racing, every watt counts. The ULTEGRA FC-R8100 crankset translates your pedal stroke into forward momentum with minimal loss, thanks to its high stiffness-to-weight ratio. A precisely tuned 12-speed interface means instant, seamless front shifts under load crucial on steep climbs, break-aways or fast finishes.

Fit & Setup Tips

• Choose crank arm length based on your leg length, saddle height and pedalling style. Shorter lengths (160-165 mm) suit smaller riders or TT/triathlon positions; 170-175 mm is ideal for standard road geometry.

• Match the chainring size to your riding terrain and style:
  52-36 aggressive road use, high topend speed
  50-34 versatile all-round gearing
  46-36 climbing and triathlon, lower cadence focus

• Ensure proper bottom bracket and spindle compatibility if fitting into a nonShimano shell or older frame.

• Regular servicing (cleaning and greasing the spindle interface, checking chainring bolts) will prolong life and preserve shifting precision.

Key Features :

• Compatible with 212-speed road groupsets

• Crank arm lengths: 160 / 165 / 170 / 172.5 / 175 mm

• Chainring options: 52-36 T, 50-34 T, 46-36 T

• HOLLOWTECH II hollow-forged crank arms for optimum stiffness-to-weight ratio bike.shimano.com

• HOLLOWGLIDE chainring design for fast, precise front shifting bike.shimano.com

• Premium road-bike fitting tailored for road racers, triathletes and performance riders

• Lightweight, race-ready construction for competitive edge