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Stages Shimano Ultegra R8100 Power Meter

Josh Matthew May 21, 2022

$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.

 

Stages R8100 Power Meter Highlights

Proven Performance

Since 2012, Stages has been making some of the most popular power meters. Accurate to within +/- 1.5%, Stages power meters are used by amateurs, pros, and everyone in between

Easy to Use

You can install a Stages power meter and be up and running in minutes. Simply remove your current left-side crank arm and bolt on your Stages power meter. No special technical skills required!

Long Battery Life

On just one CR2032 battery, the Stages provides 200 hours of battery life. In addition, the power meter offers tool free battery replacement. You can have the battery changed in about 60 seconds!

ANT+/Bluetooth SMART

With both ANT+ and Bluetooth SMART capabilities, you can use the Stages power meter with your favorite bicycle computer, smart phone, or tablet.

Lightweight

The Stages power meter adds a mere 15 grams to your bike. This makes it one of the lightest power meters you can buy.

Options

Crank arm lengths: 165 mm | 170 mm | 172.5 mm | 175 mm

 

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 (sold by us separately)
  • 5 mm Allen key

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
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