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Stages Cycling Shimano 105 Gen 3 L Power Meter Crank Arm


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  • Black, 165mm
  • Black, 170mm
  • Black, 172.5mm
  • Black, 175mm

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Shimano 105 Gen 3 L Power Meter Crank Arm

Now that you're looking to take your riding to the next level, you want to add a power meter to your setup to maximize your training but you have a couple of reservations. You don't want to waste your existing crankset, and you don’t want it to cost a fortune. Thanks to Stages Cycling and its Shimano 105 L Gen 3 Power Meter Crank Arm, you can simply add on a non-driveside crankarm letting you maintain the aesthetic and precision shifting rings while adding accurate power measurement to your steed.

This non-drive side crank arm is exactly the same as the standard 105 crank arm you currently have with a Stages power meter affixed to its inner surface. Tucked inside this little pod, strain gauges and an updated Gen 3 accelerometer measure torsional force and rotation speed to calculate power and deliver this data to your head unit via updated Bluetooth LE or ANT+ radios with a 6-time improvement in transmission strength. These measurements come with a claimed accuracy of +/- 1.5%, which is very much in-line with the best power meters on the market.

  • A 105 left crankarm with power measuring capability
  • Measures power with an impressive +/-1.5% accuracy
  • Active Temperature Compensation accommodates changing temperatures
  • Updated accelerator measures cadence
  • Improved wireless communication boosts the signal strength
  • Pairs with Stages Power App for firmware updates and zero resets
  • 200+ hour battery life with easily-changeable CR2032 coin-cell battery
  • Stages Cycling brings power data into an affordable price range
  • Item #SGCA03X

Shimano Hollowtech II road drivetrains
Accuracy (+/-)
Operating Time
200+ hours
Recommended Use
Manufacturer Warranty
1 year

Tech Specs

What do you think about this product?


>Rating: 5

Change the way you ride

I've used it several times
True to size
Size Bought
5` 9"
180 lbs

Excellent product, simple install, and easy to configure with your smartphone. Changed the way I ride almost immediately. If you are looking to get faster and ride longer and have never had a power meter before (like me) this one is the cheapest way to do it. I used to watch my speed to judge my effort in my workouts but watching my power output is a huge eyeopener.


Hi, Will this "Shimano 105 Gen 3 L Power Meter Crank Arm" 170mm can is compatible with the Crankset Ultegra 8000 52/36? If so, with a conventional indoor mount + this crank arm will I be able to connect/store data to apps such as garmin/zwift? Thanks! Felipe


My bike has a Shimano BB-5700, am I correct in believing this will be compatible with this crank?


Will it fit with a Gossamer FSA 175mm?

Hey Mauricio, Due to the spindle size and crank arm shape being so different from the Shimano system to FSA, this crank arm will not work with your Gossamer FSA Crankset.


Will this fit a Topstone 105 Al with a 172.5mm FSA crank (says CK-4002) on it.