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Stages CyclingShimano 105 Gen 3 L Power Meter Crank Arm

$324.99

Item # SGCA03X

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  • Black, 165mm ($324.99)
  • Black, 172.5mm ($324.99)
  • Black, 175mm ($324.99)
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Item # SGCA03X
Description

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
Materialalloy
CompatibilityShimano Hollowtech II road drivetrains
Accuracy (+/-)1.50%
BatteryCR2032
Operating Time200+ hours
Manufacturer Warranty1 year
Weight

Actual Weight

Black, 165mm
205g
7.23oz
Black, 172.5mm
215g
7.58oz
Black, 175mm
212g
7.48oz

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead

6.9oz
196g

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

Have questions? Chat with a Gearhead

What do you think about this product?

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>Rating: 4

Works great, but fairly useless

Familiarity:
I've put it through the wringer
Fit:
True to size

Easy to install, easy to connect, just seems to work. I first put it on my bike which was installed on a Tacx Neo trainer and observed pretty big power differences between the crank arm and the trainer. After doing more rides and testing I believe most the differences come from my left foot / right foot imbalance. Of course if you’ve never had a power meter that tells you your left/right power you wouldn’t know this. Pretty much immediately had buyers remorse after this and felt like I should have got a different style power meter that does measure both sides. At the end of the day the single crank arm power meter is cute and cheap but pretty much useless to help you measure and improve performance. I’d give the crank arm a five star rating because it does exactly what it says it does, installs really easily and I had zero issues with syncing it up to my watch and computers. With that said I’d highly recommend researching power meters and determining what your personal needs are and if this will work for them. In hindsight I’d save up your money and get power pedals.

>Rating: 5

First power meter

Familiarity:
I've put it through the wringer
Size Bought
165
Height
6` 1"
Weight
230 lbs

Finally decided to get a more accurate power meter, from using calculated power. It works on all the software Im using, wahoo and trainer road. Used it on a trainer and on the road. Easy to install and calibrate, just awesome!

>Rating:

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.

Hi Larry, Thank you for taking the time to ask about this. Unfortunately, I don't believe this power meter will work with that trainer. Cheers, Hannah

>Rating: 5

Perfect product

Familiarity:
I've used it several times
Fit:
True to size
Height
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.

>Rating:

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

Familiarity:
I've used it several times
Fit:
True to size
Size Bought
172.5
Height
5` 9"
Weight
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.

>Rating:

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.

>Rating:

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.

>Rating:

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