Get them before they’re gone! Shop Bikes
This carousel displays a list of buttons that updates the main product image when a button is clicked
  • Options
  • Detail Images

Stages CyclingShimano 105 Gen 3 L Power Meter Crank Arm


Item # SGCA03X

Select options
  • Cancel
  • Select options
  • Black, 165mm ($324.99)
  • Black, 170mm ($324.99)
  • Black, 172.5mm ($324.99)
  • Black, 175mm ($324.99)
Add Protect+ Powered by Extend™
  • 100% Guaranteed Returns
  • Free Shipping on orders over $50

Item # SGCA03X

Why We Like The 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

Tech Specs
CompatibilityShimano Hollowtech II road drivetrains
Accuracy (+/-)1.5%
Operating Time200+ hours
Recommended Usecycling
Manufacturer Warranty1 year

What do you think about this product?



Will this Shamano “smart” crank arm work on the Schwinn 270 recumbent bike - and will the crank arm work with Zwift? One more question - does it replace the current crank arm or go over it? Thx.

>Rating: 5

Perfect product

I've used it several times
True to size
0` 0"

After trying another brand that wouldn't calibrate and had instructions that included a troubleshooting guide that had way too many pages, I bought this one. Took me less time to install, calibrate and test than it took me to read the instructions on the other one. It installs easily, calibrates in seconds, and works consistently and steadily. Now I can see what changes my power output and how much different conditions require almost instantly. Lots of useful information to accelerate improvement! I wish there was a similar product for the SRAM Eagle drivetrain so I could put one on my mtn bike.


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

>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.


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

That will be compatible if it is 105 - they have the same bolt on interface. In fact, even if it's Tiagra it should still work.

That will be compatible if it is 105 - they have the same bolt on interface. In fact, even if it's Tiagra it should still work.


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.