Shimano Dura Ace FC-R9100-P Hollowtech II Power Meter Cranks w/o Chainrings

Item number: 56943

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Shimano Dura Ace FC-R9100-P Hollowtech II Power Meter Cranks w/o Chainrings - black/172.5 mm
Shimano Dura Ace FC-R9100-P Hollowtech II Power Meter Cranks w/o Chainrings - black/172.5 mm
Shimano Dura Ace FC-R9100-P Hollowtech II Power Meter Cranks w/o Chainrings - black/172.5 mm
Shimano Dura Ace FC-R9100-P Hollowtech II Power Meter Cranks w/o Chainrings - black/172.5 mm
  • 100 day return period
  • Online since 1998
  • Trusted Shop 4.9 / 5.00

The Dura Ace FC-R9100-P power meter cranks by Shimano - real-time power measurement

With the Dura Ace FC-R9100-P crank, Shimano has presented a power meter for the first time. This was developed together with, a Shimano subsidiary specialising in bicycle ergonomics. The power is measured in the crankarm, separately for left and right leg. The cadence as well as other important values for training, e.g. ,pedal stroke also belong to the functional range of the power meter. It can be paired with bicycle computers that are ANT+ or Bluetooth enabled. The FC-R9100-P crank thus helps to measure and record performance in real time and enables subsequent evaluation of the performance data. Just like the " normal" FC-R9100 without power measurement, the power meter crank is a Hollowtech crank with hollow forged aluminium arms and Hollowtech II construction for optimum stiffness to weight ratio. The chainrings are not supplied in the present version, only the chainring bolts.

Information regarding the return of batteries:

You can find more information here.


Application: Road, Triathlon
Type: power meter cranks (on both sides)
Compatibility: 2x
Chainring Mount: 110 mm pitch circle, 4-arm asymmetrical

Technical Information:

Series: Dura Ace R9100
Crankarm Material: aluminium
Axle Material: steel
Crankarm Length: 165.0 mm, 170.0 mm, 172.5 mm, 175.0 mm, 177.5 mm, 180.0 mm
Chainline: 43.5 mm
Q-Factor: 146 mm
Axle Diameter: 24 mm
Compatible BSA Shell Width: 68 mm
Recommended Bottom Bracket: BB-R9100 or SM-BB92-41B Pressfit Hollowtech II (not incl.)
Recommended Chain: HG-EV 11-speed, HG-X11 (e.g. CN-HG901-11)
Tolerance: +/- 2 %
Point of Measurement: crankarm
Power Source: lithium-ion battery, integrated
Battery Life: min. 300 h
Data Collected: cadence, power, right-left balance, pedal stroke uniformity, torque
Data Transfer: ANT+, Bluetooth LE


- integrated design
- water-resistant and designed for use in rainy weather
- integrated, rechargeable battery (charging time 2.5 h)
- fast system start and direct response
- total power and separate measurement of left and right leg (strain gauges in the crankarms)
- simple manual zeroing by pressing a button
- Firmware updates via E-Tube Project
- easy chainring change, because strain gauges are integrated in the crankarms and power meter in the spider
- charging via magnetic adapter
- communication with ANT+ or Bluetooth LE-enabled devices
- anodised crankarms
- FC-R9100 chainrings sold separately


A lightweight crankset not only reduces the bike's weight, but decreases rotating mass to aid in acceleration. The challenge is to reduce the weight of the crank without reducing its strength and rigidity. Shimano's advanced forging technology has solved the problem through the Hollowtech crank. Just like high quality frame tubing, a hollow crank arm can provide amazing strength and rigidity at very light weight.

Hollowtech II
The concept of the Hollowtech II technology was focused on the production of an optimised crankset that minimises the rider's effort for the ride. The high rigidity of the crankset ensures efficient power transmission when pedalling, while its low weight relieves the rider, especially over longer distances. The crankset was developed wanted to achieving an optimum ratio between stiffness, rotational efficiency, low weight and attractive appearance. Hollowtech technology enables extremely lightweight, hollow crankarms, manufactured using Shimano's exclusive forging technology, to achieve maximum stiffness. In addition, with the Hollowtech II crankset the right crank is firmly connected to the axle of the bottom bracket, achieving an optimum balance between maximum stiffness and minimum weight. The externally mounted bottom bracket offers better weight distribution and stability for more efficient power transmission.

The Powermeter's " brain" , the central unit, is located in the crankcase of the Dura Ace crankset, while the strain gauges are integrated in the crankarms. This way, they can record the performance separately on each side. The central unit is really compact and, discreetly mounted behind the chainrings, really inconspicuous. This makes this system one of the lightest and best integrated systems on the market. This construction furthermore allows an easy chainring switch without compromising the accuracy of the power meter. To carry out system checks and firmware updates, Shimano´s new E-tube-platform enables remarkably simple Bluetooth communication with your smartphone or tablet devices. To allow communication and data representation on a larger number of bicycle computers or GPS devices, the powermeter crankset has ANT+ as well as Bluetooth. An integrated, rechargeable battery supplies the power meter with energy. Charging is performed through small magnetic adapters which allow the weather resistance to be kept up at all times, as no coverings or lids have to be opened.

Manufacturer Part Numbers:

165.0 mm: I-FCR9100PAXXA
170.0 mm: I-FCR9100PCXX
172.5 mm: I-FCR9100PDXX
175.0 mm: I-FCR9100PEXX
177.5 mm: I-FCR9100PFXXA
180.0 mm: I-FCR9100PGXX


- 1 x Shimano Dura Ace FC-R9100-P cranks, incl. power meter sensors
- 1 x Shimano crank bolt
- 1 x magnet set
- 1 x 1.5 m charging cable
- 1 x magnet positioning tool
- 1 Shimano TL-FC40 crank installation tool
- 4 x chainring bolts
- not incl. chainrings
- not incl. bottom bracket


in stock 2 to 7 days up to 10 days up to 20 days
  • black/165.0 mm
  • black/170.0 mm
  • black/172.5 mm
  • black/175.0 mm
  • black/177.5 mm
  • black/180.0 mm

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