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ShimanoDura-Ace FC-R9100-P Power Meter Crankset

Sale 35% OffCurrent price:$993.99 Original price:$1,529.99

Item # SHI00ME

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  • Black, 175mm, 50/34 ($993.99)
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Item # SHI00ME
Description

Why We Like The Dura-Ace FC-R9100-P Power Meter Crankset

Using a powermeter has been a revelation in training over the past 10 or so years. Compared to using a heart rate monitor, wattage as a metric is more specific to the effort and removes many variables that could disrupt proper training on a given ride. Of course, these numbers are only as good as the device they are coming from and knowing the precision that Shimano instills on its premium products, we know the power measurement readings are up to the accuracy that professional cyclists demand. The unit itself is very small with a strain gauge inside the spindle, a couple of sensors on the backside of each crankarm for true dual-sided power reading, and an antenna/charging port sending and receiving Bluetooth LE and ANT+ signals, nestled between two arms of the spider.

We like this design because 1) you can easily change rings without having to recalibrate the meter, 2) the sensors are small enough that they have the clearance to not interfere with bottom bracket/chainstay direct mount brakes. The sensors are tied together requiring only one intergraded, Li-ion rechargeable battery to provide roughly 300 hours of use before needing to be recharged. Shimano went to great lengths to develop its own strain gauges for measuring data. Sensors on both arms tie into another gauge safely hidden inside the spindle that quickly detects any resistance and with some math, converts the applied force and velocity into a measurable metric, wattage. Shimano uses software that automatically compensates for temperature and elevation changes, so the reading has the same +/- 2-percent accuracy in your driveway at the start of a chilly ride in the fall as it does on the top of Pike's Peak in the summer.

  • Shimano's top-of-the-line road crankset now measures watts
  • Low-profile sensors clear tight chainstays and BB mounted brakes
  • ANT+ and Bluetooth LE for transmission and firmware updates
  • Excellent Hollowglide rings lets you enjoy a full Shimano drivetrain
  • Spider allows different gearing options and doesn't affect the meter
  • Shimano brings electronic expertise to an excellent crankset so you can enjoy an all Dura-Ace affair.

Tech Specs
Arm MaterialAluminum
Arm Length170, 172.5, 175mm
Chainring Sizes50 / 34t, 52 / 36t, 53 / 39t
Bolt Circle Diameter110mm asymmetrical
Bolts4
Rings2
BB TypeHollowtech II
Spindle24mm
Q Factor146mm
Chainline43.5mm
Compatible ComponentsShimano 11-speed road
Recommended Usecycling
Manufacturer Warranty3 years
Weight

Actual Weight

Black, 175mm, 50/34
712g
25.12oz

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead

[53/39t] 63.4oz (96g), [52/36t] 1lb 8.5oz (695g), [50/34t] 1lb 8.2oz
96g), [52/36t] 1lb 8.5oz (695g), [50/34t] 1lb 8.2oz (685g

Actual weights are measured in-house by the Competitive Cyclist team.

Have questions? Chat with a Gearhead

What do you think about this product?

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>Rating: 5

So glad I bought it

Familiarity:
I've put it through the wringer
Fit:
True to size
Size Bought
53/39
Height
5` 10"
Weight
178 lbs

Easy to install. Excellent functionality. Power readings working accurately and reliably, with no difficulty in pairing.

>Rating: 5

Power meter review

Familiarity:
I've put it through the wringer

Excellent connectivity; duel sided capability allows for measurement of right/left pedaling power balance and refinement of pedaling technique. Easy to zero; holds the charge. I have had one on another bike for 3 years with no issue. This is my second dura ace 9100-P purchase and have had no issues. My power data is reproducible between the two systems. Highly recommend. The only negative is that is is crank-based so not easy to move between bikes, thus the repeat purchase.