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This sleek aerodynamic Dura-Ace Hollowtech II crankset features significant weight saving and increased rigidity through the use of a 20% stiffer chainring, resulting in optimal shifting & power transfer.

Technical Documents
Features
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Specifications
Model Number FC-7900
Series DURA-ACE
Crank Construction HOLLOWTECH II
Cassette Compatibility 10-speed
Chain Compatibility Super Narrow HG for 10-speed
Hyperdrive yes
Dual SIS yes
Reinforced Spider yes
Chainring Sets 53-42T, 52-39T, 53-39T, 54-42T, 55-42T, 56-44T
Bolt Circle Diameter 130mm
Crank Arm Length 165/167.5/170/172.5/175/177.5/180mm
Crank Arms forged aluminum/anodized
Chainrings aluminum/anodized
Chain Guard no
Bottom Bracket SM-BB7900
Chain Line 43.5mm
Spindle Length -
BB Shell Width 68/70mm
Average Weight 725g including BB