Skip to main content
X

Stages Shimano Ultegra R8100 Power Meter

Josh Matthew September 15, 2022
3.33 out of 5 based on 3 customer ratings
(3 customer reviews)

$434.99

Stages Cycling performance on Shimano’s best-selling R8100 crank arm

Clear selection

Stages Shimano Ultegra R8100 Power Meter

The Stages Shimano Ultegra R8100 Power Meter combines Shimano’s award-winning Ultegra groupset with Stages Cycling’s proven performance and dependability. The result is an accurate, lightweight, durable power that comes ready to ride on a Shimano R8100 crank arm. Compatible with all Shimano Hollowtech II road cranks, the Stages Ultegra R8100 runs off of a CR2032 battery and features 200 hours of battery life.

In addition, the power meter is extremely lightweight – adding only 15 grams to the weight of the crank arm. All Stages power meters are compatible with both ANT+ and Bluetooth SMART devices, which means you can use your favorite bicycle computer as well as a smartphone or tablet.

The Stages R8100 power meter (Generation 3) features radio antennas that are 6x more powerful than the previous version. This means better compatibility with both bike computers and watches. The new versions also feature improved accuracy (+/- 1.5%) and have an LED indicator light on the housing for improved ease of use.

 

Key Product Details

Compatibility:

This power meter is compatible with Shimano R8100 cranksets. It can also be installed on other Shimano road cranksets, as long as they use Shimano’s Hollowtech II interface. See Compatibility tab for more information.

Power Measurement:

This Stages power meter measures left leg power and doubles the value to account for both legs (assumes both legs are generating the same force).

Key Features:

Affordable, accurate to within +/- 1.5%, lightweight at only 15 grams of added weight, 200+ hours of battery life, CR2032 user-replaceable battery, ANT+ and Bluetooth compatible, easy to install. See Specs tab for more information.

Advice From Our Staff:

Stages left side crank arms are some of our best-selling units. They work with most Shimano cranksets, are affordable and easy to install. The one consideration is they only measure left leg power compared to some other power meters that measure power from both legs (those versions usually cost more however).

 

Options For This Power Meter

Crank arm lengths: This power meter is available in the following crank arm lengths:

  • 165 mm | 170 mm | 172.5 mm | 175 mm

Compatibility

Crankset: The Stages Shimano Ultegra R8100 Power Meter is compatible with Shimano R8100 cranksets.

Please note, the power meter can also be installed other Shimano road cranksets, as long as they use Shimano's Hollowtech II interface. These cranksets can easily be identified by the two opposing pinch bolts that are used to secure the left side crank arm. Please see the image below and contact us if you have any questions on compatibility.Shimano Hollowtech II Left Crank Arm

Check Frame Clearance: Crank-arm based power meters like this one attach a sensor on the inside of the left crank arm. On some bikes, there is not enough room between the left crank arm and the chainstay for the sensor to clear the frame. Therefore, you should make sure you have at least 10 mm of clearance between the left crank arm and the chainstay - and that you don't have a bottom bracket mounted rear brake (used on some aero and TT bikes). The important area to measure is right in the middle of the crank arm. Please refer to the image below.

If you find that you have around 7-9 mm of clearance, what many people will do is simply install a 1 or 2 mm bottom bracket spacer (between the left crank arm and the frame), which will give them the clearance they need.

The clearance between the frame and left side power meter crank arm

Stages Ultegra R8100 Power Meter Specs

NameStages Shimano Ultegra R8100
Bike TypeRoad
Location of Power MeasurementCrank Arm
Left or Both Legs MeasuredLeft only
Independent Left/Right MeasurementNo
InstallationEasier
Crank Arm MaterialAluminum
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 1.5%
Automatic Temp. CompensationYes
Weight15 grams (added weight)
Battery TypeCR2032 coin cell
Battery Life200+ hours
Method of Cadence MeasurementAccelerometer
Warranty1 year

In the Box

  • Stages Power Meter
  • 2032 coin cell battery
  • Quick Start guide

Tools Needed for Installation

You will need the following tools for installation of this product. You can purchase many of these commonly used tools in our store.

  • Shimano Crank Arm Cap Tool
  • 5 mm Allen key
3 reviews for Stages Shimano Ultegra R8100 Power Meter
  1. Arturo (verified owner)

    So far the Ultegra 8100 is working just fine! Had to adjust it a few times to engage it with my Garmin but its working great so far!
    Thanks again with the speedy delivery guys!

    • Power Meter City

      Looks like you are enjoying them, Arturo! Great choice BTW! Please let us know if there is anything else we can do!

  2. Rob

    I decided to skip Shimano’s R9200 power meter for my 12-speed build and instead use this Stages left-side unit. My previous power meter was an R9100p and while it’s a great unit, I didn’t notice much benefit from the dual sided power because of my balanced L/R ratio. The Stages power meter is way less expensive and it connected to my Garmin 1030 without any trouble at all. If the runtime is 300hrs as claimed I will be perfectly happy.

    • Power Meter City

      Good choice, Rob! Thank you for this amazing review, we hope you will continue to enjoy your new Stages power meter and we are here if there is anything else we can help you with! Ride safe!

  3. Dan (verified owner)

    Out of the box, didn’t work. The power meter is being picked up by both my Garmin 1050 and Hammerhead Karoo II, and calibrates, but is not transmitting the power data to either head unit. Had to open a ticket with Stages. Right now, I would say skip Stages and look for another left side crank power meter,

Add a review

The maximum upload file size: 5 MB. You can upload: image, audio, video, document, spreadsheet, interactive, text, archive, code, other. Links to YouTube, Facebook, Twitter and other services inserted in the comment text will be automatically embedded. Drop file here

YOUR RECENTLY VIEWED PRODUCTS

OTHER CUSTOMERS ALSO VIEWED

THIS PRODUCT IS FREQUENTLY BOUGHT WITH

Shopping Cart