Stages Shimano Ultegra R8100 Dual-Sided Power Meter
March 27, 2023$864.99
Stages proven performance and dependability on a Shimano Ultegra R8100 crankset
Stages Shimano Ultegra R8100 Dual-Sided Power Meter
The Stages Shimano Ultegra R8100 Dual-Sided Power Meter features Stages proven performance and dependability on a Shimano Ultegra R8100 crankset. With a power sensor on both crank arms, this Stages power meter measures power from both legs and also provides L/R power measurement, making it a valuable training tool. In addition, its accurate to 1.5%, features dual ANT+ and Bluetooth SMART compatibility and runs off two CR2032 batteries. The Stages R8100 Dual-Sided Power Meter is extremely lightweight, adding only 35 grams to the crankset.
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 Stages 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 +/- 1.5%, lightweight at only 35 grams of added weight, 200+ hours of battery life, CR2032 user-replaceable battery, 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 and as well as provides left vs. right leg power.
Options For This Power Meter
- Chainrings: 50/34 | 52/36
- Crank arm lengths: 165 mm | 170 mm | 172.5 mm | 175 mm
Other Versions to Consider
Left Side R8100: We also sell the Stages Shimano Ultegra R8100 Power Meter which is a left side crank arm only. It is more affordable, however it only measures left leg power.
Compatibility
Bottom Bracket: 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.
Stages Shimano Ultegra R8100 Power Meter Specs
| Name | Stages R8100 Dual-Sided |
| Bike Type | Road |
| Location of Power Measurement | Crank arm |
| Left or Both Legs Measured | Both |
| Independent Left/Right Measurement | Yes |
| Installation | More involved (60 min. estimated) |
| Crank Arm Material | Aluminum |
| Communication Protocol | ANT+ and Bluetooth SMART |
| Claimed Accuracy | +/- 1.5% |
| Active Temperature Compensation | Yes |
| Weight | 35 grams (added weight) |
| Battery Type | CR2032 coin cell |
| Battery Life | 200+ hours |
| Method of Cadence Measurement | Accelerometer |
| BCD | 110 4-bolt asymmetric |
| Spindle Size | 24 mm |
| Q Factor | 146 mm |
| Warranty | 1 year |
In the Box
- Stages Crankset Power Meter
- 2 2032 coin cell batteries
- Lifetime access to Stages Link for power meter management and firmware upgrade
- 2 months free access to Stages Link premium training and coaching features
- User 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.
- 5 mm Allen key
- Shimano Crank Arm Cap Tool
- Phillips screwdriver
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.
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