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Stages Cycling Gen 3 Shimano Ultegra R8000 Single Leg Power Meter Crank Arm


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  • Grey, 170mm

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Gen 3 Shimano Ultegra R8000 Single Leg Power Meter Crank Arm

Finding time to train can be trying in a world of 9-to-5 work life, family, and long commutes —not to mention wanting to have a well-rounded existence between friends, hobbies, and fitness. This juggling act can make finding the hours to train trying, so its important that you get the most out of what little time you may have. With the Stages Cycling Shimano Ultegra R8000 Single Leg Power Meter Crank Arm you'll find all of the data you want, without the price tag that destroys your annual upgrade budget, so you can push yourself harder to reach for gains. It collects data with its easy to install left-leg power meter to deliver tangible information and reliable numbers to improve your ride, and overall fitness.

The key behind this crank arm is the little power meter pod affixed to its inner face, which takes what originally was a standard Ultegra 8000 crank arm to the next level and adds the ability to gather pinpoint power data to better measure your ride. It utilizes a blend of strain gauges and an accelerometer to gather position and force data 64 times per second and deliver power readings with a claimed +/- 1.5% accuracy, half a percent more accurate than previous models, and right in line with what we'd expect from any quality power meter.

For the gram counters out there, the Stages meter adds a minuscule 15 grams to the crank arm, which is a tiny concession to gain the massive data tracking and training specificity having a power meter affords. To put it in perspective, choosing the smaller safety pins the next time you don a race number should easily balance things out. This crank runs off of a coincel battery, offering up to 200-hours of battery life. Since the meter sits externally on the crank it's easy to swap mid-season without tools. The meter its self is well encased, earning an IPX7 waterproof rating to give you peace of mind if a storm breaks out on race day. When stormy weather rolls in, or the changing seasons cause the temperature to fluctuate, you'll be happy to find that the power meter has active temperature compensation to continually calibrate to the dropping and rising mercury on your ride, continuing to provide you with accurate data.

  • Up your training results with a left crank power meter
  • Measures power with +/- 1.5% accuracy
  • Active Temperature Compensation maintains accuracy
  • Internal accelerometer measures cadence
  • Powered by an easily replaceable CR2032 coin cell battery
  • Communicates via Bluetooth Smart and ANT+ wireless protocols
  • Pairs with Stages Power App for firmware updates and zero resets
  • Stages Cycling brings power data into an affordable price range
  • Item #SGC000S

Arm Material
Arm Length
165mm, 170mm, 172.5mm, 175mm
Bolt Circle Diameter
BB Type
Hollowtech II
Q Factor
Compatible Components
Shimano Ultegra 8000, Shimano Hollowtech II
Recommended Use
Manufacturer Warranty
1 year

Tech Specs

What do you think about this product?


>Rating: 5

First Power Meter

I've used it several times
True to size

Was not sure what to expect for first time power meter user. Easy to install. Needed to purchase a Shimano crank cap tool to remove and install in addition to allen wrench. Easy setup with Garmin 810. Time will tell if it improves my training.

>Rating: 5

Works great at a low cost

I've put it through the wringer

I'd been training for years with just heart rate and perceived effort which, shockingly, did not lead to big gains. Stepped up and got a Stages and it's been extremely helpful - have a better understanding of how many matches I can burn, how long I can keep a certain power, and seeing real-time progression. I've heard rumors about Stages being a bit inaccurate, especially when you're hitting VO2 efforts or something like that. But in the end, consistency is key, and I've found the Stages to be very consistent. Maybe I'm missing something, but I wish it could show battery level on my head unit. On the other hand though, I've heard complaints about power meters that cost 2-3x as much as the Stages. I think only having a nag about a button cell battery is a pretty good deal.

>Rating: 5

Stages PM for Ultegra

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

This is my 2nd Stages and the prices has dropped!! The power seems to correlate well with my normal numbers, although it was only 1 ride. My first one is on a BMC and this new one on a Lynskey. Love my Stages PM’s.

>Rating: 4

Gift item

don't really know much about bikes and what not but I got this as a gift for a friend

Your'e a great friend!!

I'll be your friend


Are you able to provide a picture of the stages R8000 next to ultegra R6800? I'd like to see the difference in color side by side.


Will this arm work on a GRX crank?


Probably a dumb question but will it pair with my Garmin or only the stages app?

Stages works with Garmin as its ANT and Bluetooth compatible

Yes, it will pair w the Garmin!! You can calibrate w the Stages app.


I'm assuming it is but thought I would ask anyways....compatible with Ultegra 6800 as well?

It'll look funny with different generation ultegra crankset arms don't you think?

The ultegra crank arms work with other iterations of ultegra, but the aesthetics will be off!!