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  • Pioneer Shimano Ultegra R8000 Single Leg Power Meter Crank Arm
  • Pioneer Shimano Ultegra R8000 Single Leg Power Meter Crank Arm       Side
  • Pioneer Shimano Ultegra R8000 Single Leg Power Meter Crank Arm       Back
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PioneerShimano Ultegra R8000 Single Leg Power Meter Crank Arm
Sale 30% Off$391.99 $559.99

Item # PNR000K

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  • Grey, 165mm ($391.99)
  • Grey, 170mm ($391.99)
  • Grey, 172.5mm ($391.99)
  • Grey, 175mm ($391.99)
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Item # PNR000K

Train smarter and race faster.

When it's time to go the power meter route, take a good look at the Pioneer Shimano Ultegra R8000 Single Leg Power Meter Crank Arm if you're interested in accurate power metrics and already ride with a Shimano Ultegra R8000 Crankset. The R8000 Single Leg Power Meter Crank Arm provides an efficient, relatively cheap means to chart your riding performance, so you can improve your power output for training and racing purposes without blowing an entire mortgage payment on a more expensive unit. It's the result of three years of continuous development by Pioneer, who worked diligently with pros to improve upon the technology used on Pioneer's first offering.

This crank arm-mounted power unit uses strain gauge technology to measure pedaling force, direction, and overall efficiency, meeting the industry benchmark of +/- 2% accuracy. The power meter sports a sleek profile that resides inside the crank arm, adding a mere 22 grams to the crank arm for a total weight of 219 grams. As you pedal, sensors capture 12 points of rotation at 30-degree intervals, taking a measurement 16 times per capture point for greater accuracy. As you're checking the head unit mid-ride, you'll find the heading "pedaling efficiency," which is a combination of force measurements that together provide the total power output for each crank rotation. Ultimately, this means Pioneer is able to deliver a single accurate measurement that considers the entire pedal stroke with this crank arm-based power unit.

Training and racing with fluctuations in temperature and rising elevation figures often wrecks havoc on power meters. Understanding this burden on traditional power meters, Pioneer addresses this problem with Zero Point Calibration with Active Temperature Memory Adjustment. This technology allows the power meter to anticipate and adapt to environmental changes, so you won't have to kill your momentum mid-ride while you freewheel to let the unit zero out.

It's fully compatible with ANT+ head units, making pairing a seamless affair with your favorite cycling computers and fitness apps. To further analyze each of the 12 force vectors individually, Pioneer's newest HDPower Metrics and Cyclo Sphere program works in tandem with Pioneer cycling computers. It's worth noting that although it's intended to seamlessly pair with your Ultegra R8000 crankset for a perfect fit and finish, it is compatible with Shimano's 6800 crankset if you don't mind the less-than-perfect match.

  • Single-leg power meter for Shimano Ultegra R8000 crankset
  • Economic solution to pricier power meters on the market
  • Measures watts at 12 points during each pedal rotation
  • +/- 2% accuracy meets industry standard for power meters
  • ANT+ compatibility syncs up with popular head units
  • HDPower Metrics available with Pioneer cycling computers
Tech SpecsWeight
Tech Specs
Arm Material
Arm Length
165mm, 170mm, 172.5mm, 175mm
Compatible Components
Shimano Ultegra R8000, 6800 Cranks
Recommended Use
road cycling
Manufacturer Warranty
2 years

Actual Weight

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

Have questions? Chat with a Gearhead



Grey, 165mm
Grey, 170mm
Grey, 172.5mm
Grey, 175mm

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead

[crank and sensor] 219g, [sensor only] 22g

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Unanswered Question
Avg. ride time: 0m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Can I still fit my Garmin cadence sensor next to the power meter device on the left crank arm? It appears like it would not work or be a tight fit. Thanks

Avg. ride time: 1h 51m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Awesome intro to power meters

  • Familiarity: I've used it several times

This is my first power meter, and I'm a big fan. Easy to install, easy to pair (Garmin Edge 520), and provides great data. Cyclo Sphere, Pioneer's free software, is a little dense but good. I'd recommend this for anyone looking to nerd out on power data.

Gateway Power Meter

  • Familiarity: I've put it through the wringer

This Pioneer unit you see above is similar style to what Stages offers. I think the best part about this is that you have the ability to upgrade to a full dual arm power meter later on using the upgrade kit. Once you're upgraded, you have one of the few true dual leg left/right reading power meters on the market. Pioneer has plenty of experience in electronics, and I've had zero issues running mine for the past year. Would definitely recommend to anyone looking to get into power meters but either not sure if they'd use them, or not looking to spend (relatively speaking) a ton of money.

What kind of technology are you using it with? Curious how well it might work with a Garmin Edge 520.