Shimano Ultegra 2x Crankset 12spd. FC-R8100

High‑Performance 12‑Speed Crankset for Road Cycling.

The Shimano Ultegra FC‑R8100 2×12‑Speed Crankset brings legendary Shimano performance to serious road riders — delivering a refined balance of stiffness, strength, and weight with precise, efficient front shifting. Designed as part of Shimano’s 12‑speed Ultegra lineup, this crankset features Hollowtech II construction and Hollowglide chainrings for confident power transfer and crisp gear changes across varied terrain.

Key Features

• Engineered for 12‑Speed Road Performance: Optimized for Shimano’s 12‑speed drivetrains with smooth, reliable shifting and drivetrain efficiency.
• Hollowtech II Crank Arms: Hollow aluminum arms and outboard bearings deliver excellent stiffness‑to‑weight ratio and responsive pedaling.
• Hollowglide Chainrings: Lightweight yet strong alloy chainrings improve power transfer and front shifting precision across 50‑34T and 52‑36T options.
• Multiple Crank Arm Lengths: Available in sizes from 160 mm up to 175 mm to suit a wide range of riders and biomechanical needs.
• Sleek Anodized Finish: Durable surface treatment resists wear and complements the rest of a modern road build.

Specifications

• Model: Ultegra FC‑R8100
• Speeds: 2×12
• Crank Arm Material: Hollow aluminum (Hollowtech II)
• Chainring Material: Aluminum / CFRP outer with aluminum inner
• Chainline: 44.5 mm
• Q‑Factor: 148 mm
• BCD / Mount: Shimano 110 mm asymmetrical 4‑arm
• Compatible Bottom Bracket: Hollowtech II external cups (sold separately)
• Chainring Options: 50‑34T, 52‑36T
• Crank Arm Lengths: 160, 165, 170, 172.5, 175 mm

Why Riders Love It

Ideal for enthusiasts and racers alike, the Ultegra R8100 crankset delivers a premium ride feel with precise front shifting, excellent stiffness for climbing and sprinting, and broad gear range options. Whether you’re training, racing, or hitting long weekend rides, this crankset enhances your road build with Shimano’s proven performance and reliability.