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As the central element of the 12-speed drivetrain of the Ultegra R8100 series, the FC-R8100 crankset is characterised by the shifting quality and transmission efficiency typical of Shimano. Not only the chainrings which feature a Hollowglide construction, but also the lightweight crank arms which are manufactured using Hollowtech II technology, contribute to optimised power transmission as well as faster and more precise shifting operations.

All this adds up to a perfect balance between stiffness, stability, light weight and rotational efficiency. Numerous crank arm lengths and chainrings with 50-34 or 52-36 teeth also offer variability and an optimal gear ratio for almost every riding situation.

Technologies

The guiding principle of Shimano's Hollowtech II technology is the perfect balance between stiffness, stability, weight and rotational efficiency. The goal was to produce a crank that minimises the effort required for the drive and enables more efficient power transmission.

An exclusive forging process allows the production of extremely light crank arms that nevertheless guarantee maximum stiffness. The fixed connection of the right arm to the axle of the bottom bracket and its external bearing also serve an optimum relationship between stiffness and low weight.

Specifications

Material Crank arms, inner chainring: aluminium (anodised)
Outer chainring: aluminium (anodized), carbon fiber reinforced polymer (CFRP)
Axle: steel (plated)
Compatibility Front derailleur: FD-R9250, FD-R8150
Bottom bracket: SM-BBR60 (thread type), SM-BB72-41B (Press Fit)
Chain: CN-M9100, CN-M8100, CN-M7100, CN-M6100
Crank Arm Length 160, 165, 170, 172,5, 175
Shifting System 12-speed
Bottom Bracket Axle Profile 24mm Hollow Shaft
Bottom Bracket Case Width 68mm, 70mm
Road - Bolt Circle Diameter 110mm
Chainring Mount 2-speed
Chain Line 44.5mm
Q-Factor 148mm
Colour Black
Weight Approx. 700 grams (50-34 teeth)
Approx. 711 grams (52-36 teeth)
SKU 792446
Brand Shimano
Shipping Weight 0.1000kg
Shipping Width 0.100m
Shipping Height 0.100m
Shipping Length 0.100m
Shipping Cubic 0.001000000m3

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