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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 36% Off$360.99 $559.99

Item # PNR000K

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  • Grey, 165mm ($360.99)
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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

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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Consistent, easy to use, data incorrect

  • Familiarity: I've put it through the wringer

I bought this because it was inexpensive, and I wanted a power meter on my rain bike. It was easy to set up, and as long as you don't mind the limitations of ANT+ (communication with phones), the whole thing is fine. The trouble is with its data. I have four other power meters, two Quarks, and two Power2Max NG (all spider-based, two sided). I have an Elite Suito trainer as well. Each device claims to be accurate within 1.5 to 2.5%. Each of these devices measures my power output to within 3-4 % of one another, generally. The Pioneer measures 10-15% lower in overall output, which isn't helpful for a number of reasons. I researched the matter and found that others, including professional reviewers, had experienced the same thing. Given that it's a strain gauge, and stress on the material in other places has the potential to alter data, I've made certain to torque everything on the crank to specs. I bought the Pioneer SGX-CA500 computer (which is an odd little duck) for 75$ on Steep & Cheap simply to update firmware, make sure calibration was correct...and to have a look at the cycling dynamic measurements. I've followed every rule and every direction, including trying several different firmware versions, and still, the readings are consistently low. I went so far as to do some math...maybe everyone else was wrong and Pioneer was correct, I thought, so I used some basic assumptions regarding tire and drive-train friction as well and wind resistance gleaned from actual research, and determined that there was no way I would have been able to move the mass of myself, my clothing, and my bike over x distance, over x time given the power output this device measured. Happily enough, the readings I received from my other meters lined up nicely. So...if you don't care much about your actual output, and are just looking for a way to measure and track comparative output...and you use nothing but the power meter, it's a cheap way to train with power. If you want *actual* numbers, however, you'll want to look elsewhere.

I agree 100% with this poster and have similar experiences with the data being consistently lower than my Stages. I think I would go with Stages in the future.

Does not fit a Cervelo P3X

    FYI does not fit a Cervelo P3X … Clearance issue. Too bad looked like good quality.

    Does this unit measure cadence as well as power? Or power only?

    It also measures cadence. That was not clear until I installed and used it.

    Is this Gen 2 or Gen 3?

    This is a Gen 2, specifically SGY-LT80. I bought one a few weeks ago, I'm pretty happy with it considering the price.

    Works well for one sided power meter

    • Familiarity: I've put it through the wringer

    I have a garmin 1000 cycling computer. I ride three times a week and it is always on my bike. It measures my peddle power and would measure both sides if I had the other half. It has helped me improve my ridding.

    Will it fit a 2019 BMC Roadmachine two-2? Wahoo ELEMNT compatibly?

    Hey Joseph - this single sided PM should fit your frame and Ultegra cranks and will be compatible with you Wahoo computer.

    Won't fit Trek Emonda SL6 Disc

    • Familiarity: I returned this product before using it

    I have a 56cm 2016 Trek Emonda SL6 Disc. The left-side version of the Pioneer Ultegra power meter would not fit on the bike. Another user mentioned it was such a close squeeze as to have rubbed off some of the paint on his frame. Mine was even tighter, and I'll be returning the power meter for another such as the Stages, which looks to have a smaller protrusion on the chainstay side.

    What does this have to do with the performance of the power meter? That's what these reviews are for. There are thousands of frames out there, and it's well known that these types of power meters have limitations regarding clearance on some frames. In fact, with a quick check on the Pioneer website under the Manuals & Brochures heading, I found this: Pioneer Compatibility Chart-TREK, which indicates the need for a 1-2 mm spacer for your bike. Your review is irresponsible because you're giving a product a low rating, not for its performance, but because you're frustrated. That misleads other consumers. Trouble is, if you'd have done your homework, you'd have known about the frame clearance issue and found the solution. I'd give you two stars, and reserve judgment on the device.

    Works great with Shimano 105 R7000

    • Familiarity: I've used it several times

    Easy to install. Works great with Shimano's new R7000 105 groupset. Highly recommended. Seems to report about 20 watts higher than my friend's Stages meter.

    This fit on a Ultegra 6700 crankset ?

    Hi Alvaro, this crank arm will fit your 6700 cranks, it just will not match visually.

    Mo data

    • Familiarity: I've used it once or twice and have initial impressions

    Used this power meter a couple of times now. Seems to be working properly and is accurate. A few notes that may help others: on the install instructions included with the unit, there was a section for installation without the magnet. This is what I attempted as I use a duotrap for speed and cadence. The unit will not work without the magnet. I read a few places that with a firmware update it will work, but I use a Garmin Edge, so I cannot verify.
    Another note: I installed on a Trek Emonda SL6, and after the first couple of rides I could see, upon very close inspection, a small rub mark on the chainstay. I don't think it's anything to worry about. most people probably wouldn't even notice it, but there are small 0.5 and 1 mm shims available for the crank arm (they should really include a couple of these for the price of power meters, but whatever). I'll probably end up putting one on at some point, although any rubbing that happened has probably worn off enough material to not rub anymore... I may just leave it. Power numbers look good and seem to be accurate. it's cold out now, so I'll keep track of it as temps get warmer in the coming months.
    For some reason, this shipped to me USPS Priority and it took almost a calendar week to get it. Ordered on Sunday, received the next Saturday.. which in this day and age of 2 day and overnight everything is disappointing. But Backcountry/competitive are good people and have always done me right, so still highly recommended.

    I'm using this with a Garmin Edge 820. It seems to work just fine without the magnet.

    There was a note in the install instructions that said the magnet wasn't necessary with an ANT+ computer.

    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

    Hey Peter, that would largely depend on the bike you are using it on and the specif chainstay of said bike. It is possible to run the Pioneer with the a cadence sensor on certain bikes for sure. Feel free to call or chat into a Gearhead for your specific application.

    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.