The Shimano Dura-Ace R9100 is a completely redesigned road groupset aimed at professionals. Every component has been designed from the ground up to create the most innovative drivetrain of all time.

Shimano Dura-Ace FC-R9100 crankset

• The new arms are 7g lighter than previous ones while maintaining the same level of stiffness.
• The asymmetrical 4-arm design ensures optimal power transmission.
• Excellent chain flip precision even under load.
• Wide range of possible combinations of gear ratios, allows to match the drive to any type of terrain.
• One mounting size for both cranks (BCD 110 mm) allows easy modification and selection of the appropriate gear combination.
• Made with vacuum arm technologies and Hollowtech II and Hollowglide sprockets.
• 43.5 mm chainline.
• Model: FC-R9100
• Gears: 50-34T
• Arm length: 170mm
• Bolt spacing (BCD): 110mm
• Arm material: Aluminum
• Axle material: steel
• Gear material: Aluminum
• Technologies: Hollowtech, Hollowtech II, Hollowglide
• Manufacturer's weight: 609g
• Q-factor: 146mm
• Adapted for use with 11-speed HG-X11 chain.
• Recommended bottom bracket insert SM-BB9100 or SM-BB92-41B (Press Fit) - not included.

Best balance of stiffness, strength, low weight and rotational performance

• A concept focused on creating the ideal cranking mechanism, maximizing power transfer for the cyclist
• Stiffness of the crank mechanism ensures pedaling efficiency
• Low weight, as a key element, supports riding longer distances that require more pedaling
• Optimum balance between stiffness and as little weight as possible
• Technology used in ultra-lightweight hollow crank mechanism
• Shimano's proprietary forging technology for rigidity
• Integration of the bottom bracket axle into the right crankset
• External bottom bracket bearing system means better weight distribution and pedaling stability, and more efficient power transfer
• Bearing location on the outside of the frame allows for better weight distribution and higher stability
• Sealed bearings increase durability and maintain excellent rotational performance for a long time

Japanese company founded in 1921 by Shozaburo Shimano.
It is one of the largest manufacturers of bicycle parts in the world.
In addition to components, it also produces cycling shoes and clothing, accessories, cleaning products and bicycle tools.
In addition, it manufactures fishing, snowboarding and golf accessories.
Shimano is the most popular bicycle parts brand in the world.