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INPEAK POWERCRANK-E TWiN2 Shimano R8100 Power Meter
September 10, 2025$1,044.99
INPEAK’s dual-sided rechargeable power meter on a Shimano Ultegra R8100 crankset
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INPEAK POWERCRANK-E TWiN2 Shimano R8100 Power Meter
The INPEAK POWERCRANK-E TWiN2 Shimano R8100 Power Meter is the perfect upgrade for riders with Shimano Ultegra R8100 drivetrains. This INPEAK power meter replaces your current 2×12 road crankset and features two rechargeable sensors. It measures the power generated by both legs independently, with left/right information gathered. Data transmits via ANT+ or Bluetooth Smart, ensuring seamless connectivity with your preferred head unit or training app.
Designed in Poland, INPEAK engineered the POWERCRANK-E TWiN2 sensors to handle whatever the Polish climate threw their way. As a result, the INPEAK TWiN2 8100 crankset is IP67-rated for water and dust resistance. Alongside water and dust protection, it features active temperature compensation from 23°F to 122°F. While the INPEAK can withstand any adventure, it is one of the lightest options available and adds only 20 grams to the crankset. With USB charging there is no more searching for a spare battery, just charge and ride.
Product Details
Key Features of the INPEAK POWERCRANK-E TWiN2 R8100 Power Meter
- Robust Durability: The IP67 water and dust sealing and wide operating temp range means training in the snow or desert is not off the cards.
- Compact Design: The sensors, at only 6 mm thick and 10 grams, fit most frames and add minimal weight.
- Rechargeable Battery: Gaining a full charge in only 2 hours, the rechargeable Li-Po battery eliminates the disposable coin-cell frustrations.
- Dual Sided Power Data: With sensors on both crank arms, the INPEAK 8100 TWiN2 can measure independent left/right leg power information.
Power Measurement
This INPEAK 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.
Compatibility
The INPEAK POWERCRANK-E TWiN2 R8100 Power Meter is compatible with Shimano 2×12 road drivetrains and 24 mm bottom brackets. Most customers that buy it already have a Shimano R8100 crankset on their bike and therefore it’s an easy swap. Just make sure there is enough clearance to your bike frame. See Compatibility tab for more information.
Considerations
The unit offers +/- 2.0% accuracy, which is slightly lower than some alternatives, though in practice this usually amounts to only a few watts either way.
Advice From Our Staff
We recommend this power meter for riders who want reliable data with a Shimano crankset. In addition, this power meter is an excellent option if you prefer a rechargeable design. It’s also a smart upgrade for anyone already using a Ultegra R8100 crankset. Installation is simple and the INPEAK POWERCRANK-E TWiN2 Shimano R8100 delivers great power data in a durable package.
Options
- Crank arm lengths: 160 | 165 mm | 170 mm | 172.5 mm | 175 mm
- Chainrings: 50/34T | 52/36T
Compatibility
Bottom Bracket: This power meter is compatible with 24 mm bottom brackets. Most customers that buy it already have a Shimano R8100 crankset on their bike and therefore, it's an easy swap.
Drivetrain:Â This power meter crankset is compatible with 2x12 Shimano drivetrains.
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 8 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 6-7 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.
INPEAK POWERCRANK-E TWiN2 Shimano R8100 Specs
| Name | INPEAK POWERCRANK-E TWiN2 R8100 |
| 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 | +/- 2.0% |
| Active Temperature Compensation | Yes |
| Weight | 716 grams (170 mm, 50-34T) |
| Battery Type | Rechargeable LiPo |
| Battery Life | 90 Hours |
| Method of Cadence Measurement | Accelerometer |
| BCD | 110 4-bolt asymmetric |
| Spindle Size | 24 mm |
| Q Factor | 148 mm |
| Warranty | 2 years |
In the Box
- INPEAK POWERCRANK-E TWiN2 Shimano R8100 Dual-Sided Power Meter
- USB dual charging cable
- User's manual
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.
Q&A
Have a question about this? Ask the staff.
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