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Shimano Ultegra R8100-P Dual-Sided Power Meter Crankset

Josh Matthew April 12, 2024

$1,049.99$1,205.99

Dual-sided power on a Shimano Ultegra R8100 crankset!

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Shimano Ultegra R8100-P Dual-Sided Power Meter Crankset

The Shimano Ultegra R8100-P Dual-Sided Power Meter Crankset offers dual-sided power on a factory Shimano crankset. With a proprietary strain gauge design and power sensors bonded to each crank arm, the Shimano power meter measures the precise pedaling forces of each leg individually. Therefore, you can see total power as well as your power balance. It also features active temperature compensation, which means it’s always accurate, even when the weather or riding conditions change.

With a rechargeable li-ion battery you get over 300 hours of battery life. This allows you to go weeks at a time without having to recharge. In addition, ANT+ and Bluetooth SMART means you can use the Shimano Ultegra Power Meter with any bike computer, smart phone or indoor training app.

 

Key Product Details

Compatibility:

This power meter is compatible with 2×12 road drivetrains and 24 mm Shimano bottom brackets. Most customers that buy it already have a Shimano R8100 crankset on their bike and therefore, it’s an easy swap. However, it can be used on any road bike as long as its 2×12 with a 24 mm bottom bracket. See Compatibility tab for more information.

Power Measurement:

This Shimano power meter has a power sensor on both crank arms and measures power from both legs. It is also able to measure your left vs. right leg power.

Key Features:

Dual-leg power measurement, can measure left vs. right leg power, accurate to within +/- 2.0%, 300+ hours of battery life, rechargeable battery, Active Temperature Compensation, ANT+ and Bluetooth compatible. See Specs tab for more information.

Advice From Our Staff:

This is a great option for customers with a Shimano R8100 drivetrain that want to keep an OEM R8100 crankset on their bike but add power. We also like that fact that this crankset measures power from both legs, has a long battery life and uses Shimano’s proprietary strain gauge technology.

 

Options For This Power Meter

The Shimano Ultegra power meter is available in the following options:

  • Crank Arm Length: 160 mm | 165 mm | 170 mm | 172.5 mm | 175 mm
  • Chainrings: 50/34 | 52/36 | No Chainrings (if you already have them)

Compatibility

Crankset: This power meter is compatible with 2x12 road drivetrains and 24 mm Shimano bottom brackets. Most customers that buy it already have a Shimano R8100 crankset on their bike and therefore, it's an easy swap. However, it can be used on any road bike as long as its 2x12 with a 24 mm bottom bracket.

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

Shimano Ultegra R8100-P Crankset Specs

NameShimano R8100-P Dual-Sided
Bike TypeRoad
Location of Power MeasurementCrank arm
Left or Both Legs MeasuredBoth
Independent Left/Right MeasurementYes
InstallationMore involved (60 min. estimated)
Crank Arm MaterialAluminum
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 2.0%
Active Temperature CompensationYes
Weight758 grams (50-34T)
Battery TypeRechargeable
Battery Life300+ hours
Method of Cadence MeasurementMagnet
BCD110 4-bolt asymmetric
Spindle Size24 mm
Q Factor148 mm
Warranty1 year

In the Box

  • Shimano Crankset Power Meter
  • EW-EC300 battery-charge cable
  • Cadence Magnet
  • User Guide

Tools Needed for Installation

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

  • 5 mm Allen key
  • Shimano Crank Arm Cap Tool

Common Questions and Answers

Question: How do I determine what length my current cranks are so I can make sure I get the same size?

  • Your crank arm length should be printed or stamped on the inside of the left crank arm, usually near the pedal end.

End of crank arm showing crank arm length

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