طبق قامه Shimano Ultegra FC-R8000 Hollowtech II Crankset

The Ultegra FC-R8000 crankset by Shimano – elegant and powerful

The Shimano Ultegra FC-R8000 11-speed crankset is characterised by its outstanding power transfer efficiency and can be easily used on road bikes with disc brakes and 135 mm over locknut dimension. With a uniform bolt circle diameter of 110 mm, four different chainring combinations can be mounted on the asymmetric 4-arm spider, resulting in a wide range of uses. As a Hollowtech crank with hollow-forged aluminium arms and featuring the Hollowtech II construction, the FC-R8000 offers an optimal stiffness-to-weight ratio. The hollow-shaped outer chainring also contributes to this. Last but not least, your road bike will also be visually enhanced by the Dura-Ace-like aesthetics of the Ultegra crankset.

Specifications:

Application: Road, Cyclocross
Compatibility: Shimano 2×11-speed
Chainring Mount: ۱۱۰ mm pitch circle, 4-arm asymmetrical

Technical Information:

Series: Ultegra R8000
Crank Arm Material: aluminium
Chainring Material: aluminium, carbon (CFRP) / aluminium (36-46 only aluminium)
Axle Material: steel
Gradation: 36-52
Crank Arm Length: 172.5 mm
Chainline: ۴۳٫۵ mm
Q-Factor: ۱۴۶ mm
Axle Diameter: ۲۴ mm
Compatible BSA Shell Width: ۶۸ mm
Recommended Bottom Bracket: SM-BBR60 or SM-BB72-41B Pressfit Hollowtech II (not incl.)
Recommended Chain: HG-EV 11-speed, HG-X11 (e.g. CN-HG701-11)

Features:

– optimised, lightweight crankarm design for excellent power transmission efficiency
– revised chainring tooth profile increases the distance to the chain for more compatibility with 135 mm over locknut dimensions and 410 mm chainstay lengths
– anodised crankarms and chainrings
– aluminium chainring bolts

Technology:

Hollowtech
Lightweight cranks reduce the total weight of the bike and above all the rotating mass which is decisive for acceleration. The challenge is to reduce the weight of the cranks without compromising stability and load capacity. Shimano’s state-of-the-art forging technology offers an ideal solution with the Hollowtech cranks. Just like a high-quality frame tube, the hollow crankarm is extremely stable and resilient at a very low weight.

Hollowtech II
What matters is the overall balance of the crankset. With regard to the entire crankset, an optimum balance between the strength of the crankarms, the rigidity of the axle, the bearing position and other features is very important. When developing the crankset, the overall balance of all individual elements was carefully considered to ensure maximum stability.
Outer bearing: On most 68 mm bottom bracket housings, the Hollowtech II 24 mm axle can be mounted outside the frame for better weight distribution and stability.
High-quality precision seals: The Hollowtech II set also features high quality precision seals in the bearing area to extend durability and maintain excellent rotation efficiency over time.
The axle and the 24 mm diameter bearings ensure optimum balance of the crankset and optimum transmission of power to the bicycle.

Hollowglide
Hollow outer chainring: The extremely stiff hollow structure reduces weight while maintaining consistent strength. Better power transfer and faster, more precise front shifting (not with 46 teeth).

Manufacturer Numbers:

۱۷۲٫۵ mm 36-52: I-FCR8000DX26

Contents:

– ۱ x Shimano Ultegra FC-R8000 crankset (34-50, 36-46, 36-52 or ۳۹-۵۳ tooth)
– ۱ x Shimano crank bolt
– bottom bracket not incl.