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The SHIMANO Ultegra FC-R8100 12-speed crankset with 172.5 mm crank arms and 52/36T chainrings (official Shimano part number IFCR8100DX26) serves as the powerhouse for Shimano Ultegra Di2 12-speed road drivetrains. Engineered to provide exceptional energy transfer and ultra-fast front shifting, it utilizes Hollowtech II technology featuring hollow-forged aluminum crank arms for an unbeatable stiffness-to-weight ratio. The outer chainring incorporates Hollowglide hollow structure design, eliminating flex during high-wattage efforts and guaranteeing precise chain guidance under load. Its 52/36 mid-compact gearing is tailored for competitive riders and enthusiasts looking for high top-end speeds on flat terrain while keeping versatile gearing options for climbs.
Key Specifications & Compatibility :
- Product Type: Double 12-speed road cycling crankset.
- Official SHIMANO Reference: IFCR8100DX26.
- Crank Arm Length: 172.5 mm.
- Chainring Combination: 52/36 Teeth (52-36T mid-compact).
- Bolt Circle Diameter (BCD): 110 mm, 4-bolt asymmetrical pattern.
- Axle Spindle Diameter: 24 mm standard (Hollowtech II).
- Chainline / Q-Factor: 44.5 mm / 148 mm.
- Drivetrain Compatibility: SHIMANO 12-Speed Road (Di2).
- Chain Compatibility: SHIMANO HG 12-Speed (e.g., CN-M8100, CN-M9100).
- Recommended Bottom Brackets: SM-BBR60 (Threaded) / SM-BB72-41B (Press-Fit).
- Material: Forged aluminum crank arms / Hollowglide aluminum-CFRP outer ring.
- Weight: ~711 g.
- Kit Contents: Left crank arm, right crank arm with integrated spindle and 52/36T chainrings, crank arm fixing bolt (bottom bracket sold separately).
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