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Shimano Dura-Ace FC−R9100 180mm 53/39T 11 Speed Crankset

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Item Number
IFCR9100GX39
$706.99
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Product ID
202027
Featuring superb Japanese workmanship and a highly polished near black-to-pewter finish, the Dura-Ace ethos can be immediately identified with one quick look. The 2nd Gen, 2x11-SP Dura-Ace FC-R9100 Front Crankset has a distinct asymmetric 4-arm design and the driveside arm has been augmented within the same asymmetric bolt circle pattern. Width and size were added to the drive side arm for optimal power and efficiency in the most crucial phase of the pedal stroke and might have caused weight issues but for the benefit of Hollowtech II technology to manage that while still maintaining the strength you need for better power transfer and more precise front shifting. This particular model features a crank arm length of 180mm. The teeth of this 53-39T chainring have also been re-engineered for greater efficiency, reduced friction and wear, and faster, quieter shifting performance (with mechanical or Di2 systems). The reconsideration of the tooth profiles was also driven by the more extreme chainlines found on today's shorter chainstay frames, which when combined with greater cassette range and new rear spacing, totally changes the load the chain must manage for safety, as well as shifting performance. This, and many more benefits, will come to your attention once you've mounted and used the crankset a few times. One thing is for sure, if you thought reliable, high-quality bike components were a thing of the past, think again. HollowGlide Technology • HOLLOWGLIDE - Hollow technology on outer chainring. A high-rigidity hollow structure cuts down on weight yet maintains strength. Better power transfer and quicker and more precise front shifting. HollowTech II Technology • Provides the best balance of stiffness, strength, weight and rotating performance. The concept of HOLLOWTECH II technology is focused on producing a superior crankset which will maximize a rider’s power transfer. The rigidity of the crankset ensures pedalling efficiency while its weight, a key element of the crankset, you want light, aids in cycling longer distances over which the rider needs to pedal more. Naturally, SHIMANO strove for the optimum balance between the conflicting needs of stiffness while producing a lightweight crank. HOLLOWTECH technology is an ultra-lightweight hollow crankarm created with the company’s own proprietary forging technology which also maintains rigidity. The addition of HOLLOWTECH II technology integrates the bottom bracket axle with the right crankarm for more stiffness and a weight savings to achieve a high-dimensional balance. Its outboard bottom bracket bearing system provides better weight distribution and more pedalling stability, allowing for more efficient power transfer.
• Shimano HOLLOWTECH II Crankset (2x11-speed) • Proprietary asymmetric 4-arm construction crankset • HOLLOWGLIDE chainrings feature new tooth profiles for improved shifting, less wear • Delivers optimum power transfer • Best balance for lighter weight (-7g) and efficiency • New designed crank arm for optimal power transfer and shift refinement • Maintains high rigidity and reduces weight • Driveside arm is larger and offset towards ring for optimal force in stroke • Adapted for race-specific disc brake system • Shorter length of rear centre with O.L.D.135mm • Redesign of gear teeth profile to fit wider gear pitch • Rider tuned gearing options • 53-39T gear combination Specifications: • Series : DURA-ACE • Crank Construction : HOLLOWTECH II technology • Crank Arm Length : 180 mm • Chainring: 53-39T • Effective Chain Line : 43.5 mm • Bolt Circle Diameter: 110mm BCD • Bottom Bracket: BB-R9100 | PressFit SM-BB92-41B • Threaded BB Shell Width: 68 / 70mm • Compatible Shimano Chains: HG-EV 11-speed | HG-X11 • Large Ring Material: Anodized Aluminium | CFRP composite • Small Ring Material: Anodized Aluminium has been offset inboard to frame .4mm • Rings fastened underneath with anodized aluminium bolts • Crank arm finish is anodized Near Black, then polished • Chainring finish is anodized Near Black fade to Pewter, then polished • Weight: 691 grams (for 53-39T model) • Recommended Use: Road |Time Trial | Triathlon • Country of Manufacture: Japan NOTE: Does not include bottom bracket

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