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Shimano Dura-Ace R9100 R Power Meter Crank Arm
Deciding what power meter to get can be a difficult decision, but if your running Shimano's current top-tier road group, with choices like the Shimano Dura-Ace R9100 R Gen 3 Power Meter Crank Arm with Chainrings from Stages Cycling, it helps us make up our minds pretty quickly. This driveside crank gets big marks in our books as it allows you to run a complete Dura-Ace drivetrain so you don't have to part with those precise shifting rings and excellent stiffness of the 4-arm asymmetric design. Sure, there are other options on the market that utilize the 9100 crankset, but none offer quite the simplicity and come in at a price that compares to this Stages model. Now you can train like the pros with power while choosing something that comes in at a price that's affordable in the powermeter world. This driveside crankarm transmits power data from a pod near the spider for accuracy and doesn't suffer from clearance issues with the frame as the non-drive side crankarms sensors and chainstays were prone to do, all while maintaining the beauty of a complete Dura-Ace R9100 group with its wide and stiff crank arms and precisely shifting rings.
As we mentioned above, this Stages crankarm is an ideal option if your bike is currently outfitted with a Dura-Ace 9100 group. That way, the crank perfectly matches the aesthetic of the complete group, providing you with all of the engineering bestowed by the Shimano engineers, with power measurement readings courtesy of the Stages engineers. The power meter is tiny and only adds a nominal 20-grams to Dura-Ace's base weight. Tucked inside this little pod are strain gauges and an updated accelerometer that measures force and rotation delivering the power readings to your head unit with a claimed accuracy of +/- 1.5%, which is right in line with other quality power meters on the market.
The meter also incorporates Stage's Active Temperature Compensation (ATC), which compensates for the natural expansion and contraction of the strain gauges and adjusts the readings depending on external temperature. ATC accounts for those temperature changes without requiring you to stop pedaling in order to zero the system. Other weather factors to consider are the rain and wet, and Stages protects the power meter with a water resistance rating of IPX7, keeping the internal electronics dry during rainy rides and bike washes. Stages meters are mountain and 'cross bike tough even through creek crossings and Team Sky post-race power washings, and the IPX7 rating gives the meter protection from the wet in 1-meter deep water for up to 30 minutes. The power meter is powered by a readily available CR2032 battery and offers up to 175 hours of riding with data, with an easy to replace and simple Philips head screw access point. Gen 3 models receive upgraded Bluetooth LE and ANT+ radios which offer a 6-time improvement of data transmission strength so your head unit never misses a watt. Additionally, wireless firmware downloads are available to keep the power meter up to date.
- Drive side Dura-Ace crank and chainrings to measure power
- Measures power with a +/-1.5% accuracy
- Data is sent to your computer via ANT+ and Bluetooth LE signals
- Active Temperature Compensation adjusts readings with temp swings
- Upgraded accelerometer improves accuracy
- New radios enable stronger wireless communication
- Pairs with Stages Power App for firmware updates and zero resets
- 175+ hour battery life with user serviceable CR2032 coin cell battery
- Item #SGC001B
- Arm Material
- Arm Length
- 165, 170, 172.5, 175mm
- Chainring Sizes
- 50/34, 52/36, 53/39t
- Bolt Circle Diameter
- 110mm asym
- Compatible Components
- Shimal 11-speed road
- Claimed Weight
- [power meter] 20g
- Recommended Use
- Manufacturer Warranty
- 1 year
What do you think about this product?
June 2, 2020
Great power meter.
- I've put it through the wringer
- 5` 10"
- 155 lbs
Worked perfect for me straight out of the box. I have put over 1500 miles on it so far and haven't had any issues at all. Connectivity for both Bluetooth and ANT+ have been flawless. I do live in Southern California so I have only ridden it in warm dry weather, I have not tested it in wet conditions yet. I have run analysis comparing power readings of right sided Stages (I only have the drive side power meter right now) and Wahoo Kickr (2017) and the Stages seems to measure about 5-7% lower. Not sure if that is the Kickr or Stages that is off but it has been pretty consistent which is what really matters. I have ordered the left crank as well now, so I may update this once I receive that and get some experience but overall the Drive side powermeter is doing great with no issues so it seems like Stages fixed what ever was wrong with the previous versions.
Roger D J.
October 21, 2018
Competitive cyclist offers no support!
- I've used it once or twice and have initial impressions
The unit is not working out of the box. I chat up my friendly competitive cyclist rep to get an exchange. I was told in an unfriendly way that corp policy is to not offer support on this product and that I need to go directly to the manufacturer. You are not taking care of your customer or standing behind the product you sell. I will be going elsewhere for future purchases. I am going to return this product and buy from a company that does support their end user
August 30, 2019
But, they accepted the return, right? I’ve never had issues with CS taking returns on defective items but they are not set up to service any parts.
December 28, 2019
I’ve used this crank for two years and find it to be bomb-proof, easy to service (battery change) and trouble free. Have been a Comp Cyclist customer for many years and think they do an amazing job. Likewise, Stages cycling folks are super helpful, prompt, and go above and beyond when I’ve needed their help. Not sure what the issue was with your meter but I am sure Stages can help you figure it out.
November 25, 2018
Is it a dual sided power meter ?
November 29, 2018
This is drive side only, feel free to reach out a Gearhead if you would like to talk through the best options for you for a dual sided power meter.
August 30, 2019
Right side. It can be paired with a left side PM or used by itself. Useful for bikes with BB-mounted rim brakes.