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Stages Cycling Cannondale Hollowgram SI Single Leg Power Meter Crank Arm

Sale $384.24$579.99 $ 34% Off

Item # SGC0009

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  • Black, 165mm ($384.24)
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Item # SGC0009


Power upgrade.

With all the focus on power meters for the big three component brands, it's easy for your trusty Cannondale's Hollowgram crankset to get lost in the discussion. Stages Cycling is here to make sure you feel included and have access to power without giving up your crankset choice with its Cannondale Hollowgram SI Single Leg Power Meter Crank Arm. Well known for providing accurate single-leg power readings, Stages meters let you maintain the continuity of your crankset and gather necessary training data at a fraction of the cost seen with dual-leg systems.

The difference between your current left crank arm and this one is the little power meter pod affixed to its inner face, which adds the ability to gather pinpoint power data to better measure your ride. It utilizes a blend of strain gauges and an accelerometer to map position and force data 64 times per second and deliver power readings with a claimed +/-2% accuracy that's right in line with what we'd expect from any quality power meter.

For the gram-conscious racers out there, the Stages power meter adds a miniscule 20 grams to the crank arm, which is a tiny concession when gaining the massive data tracking and training specificity having a power meter affords. To put that in perspective, choosing the smaller safety pins the next time you don a race number should easily balance things out.

  • A Hollowgram SI left crank arm with power reading capability
  • Measures power with the industry standard of +/-2% accuracy
  • Active Temperature Compensation accommodates changing conditions
  • Internal accelerometer maps cadence with no additional sensors
  • Wireless communication keeps use and maintenance simple
  • Pairs with Stages Power App for updates and zero resets
  • 200+ hour battery life with common CR2032 battery
  • Stages Cycling sets the standard for affordable power meters

Tech Specs

Arm Material:
Arm Length:
165mm, 170mm, 172.5mm, 175mm
Compatible Components:
2014 and newer Cannondale Hollowgram SI cranksets, Cannondale SISL2 cranksets
Recommended Use:
Manufacturer Warranty:
1 year



Actual Weight

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

Have questions? Chat with a Gearhead



Black, 165mm

Reviews & Community


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Avg. ride time: 5h 38m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Does what it says on the tin

  • Familiarity: I've put it through the wringer

Quick to install and easy to pair with my Garmin 520. Also easy to sync with the iPhone app to upgrade the firmware. So far no problems at all. Power readings seem consistent with what I'd expect and some of my buddies with power meters. Not had a power meter before - really pleased with this purchase and the power data has definitely helped my training and riding.

Hi, will it fit a MTB hollowgram si crank with AI offset? It's for an Scalpel 2017

I don't think so can fit mtb hollowgram si crank with AI offset. May be go to facebook from owner of cannondale club

Avg. ride time: 10h 50m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Is this Gen2 or Gen3??

Hey Chris, this is a Gen 3 version. Feel free to reach me at 801.204.4547 or if you have any other questions or would like to put in an order for one! Best, Connor

just works

  • Familiarity: I've used it several times

I already had bb30 crank arm puller so installation was a breeze. No issues at all pairing and calibrating with my Garmin 500. Seems more responsive than the PowerTap hub. Hope this helps.

Power at its best

  • Familiarity: I've used it several times

I’ve been looking to get a power meter for 5+ years, but the cost has kept me away as well as all of the reviews about power accuracy — which one to get? Well, I finally took the plunge and grabbed this one.

3-months in and I’m loving it. It’s provided reliable power feeds to my Wahoo ELMNT Bolt, whose software does a great job showing you your power info. I feel like I’m gettting consistent power readings, and am really enjoying the extra data point. Really feel like I can monitor my efforts better when combining my wattage with my HR.

Super easy to install, and I’ve regularly change it between my Road and Cross bike - literally takes 5min max.

Super Buttery Setup

  • Familiarity: I've used it several times

Super easy to set up and get running with my Garmin unit. Installation is pretty easy depending on the type of cranks you have. Usually, it’s just a matter of removing the non-drive side arm and replacing with the Stages unit.

Make sure to be very careful when putting the battery cover back on. You don’t want to break the little tabs on the cover, otherwise it won’t stay on properly and the unit will drop readings. I have been calibrating it on every ride and sometimes stop during a ride to re-calibrate if i feel like my numbers are off. Overall it’s been a good product for the money and ease of installation.