INPEAK Powercrank-E Ultegra R8100 USB Power Meter

If you want to train more seriously or want insights into your cycling performance, a power meter is a must-have. It provides a constant way to measure your cycling efforts and the ideal tool to train efficiently.

High accuracy
The INPEAK Powercrank-E provides highly accurate measurements with a deviation of only 2%, at power outputs from 20 to 2000 watts. Through Torque Effectiveness as well as Pedal Smoothness analyses, it gives you unique insights into your pedal stroke.

Single-sided powermeter
The INPEAK power meter measures the power on the left crank and doubles it for a total power count over both legs. For most riders without limitations, the power on the left and right leg is almost the same for even efforts. If you have an imbalance between your left and right leg, this may result in a small deviation in the data. However, this deviation will remain constant, so your data will always be easy to compare with your own data. Furthermore, the power meter measures your cadence as standard.

Low weight
Due to its very lightweight design, the sensor only adds 10 grams to a standard Shimano crank. This makes it one of the lightest power meters on the market!

Battery life
The INPEAK Powercrank-E has an internal battery that is rechargeable with the included magnetic USB cable. The battery lasts up to 90 hours and is fully recharged within 2 hours. The battery has consistent capacity, with a 20% capacity loss after 300 full charge cycles. So, you don't have to worry about the battery deteriorating significantly over time.

Connectivity
The power meter only includes a manual zero-offset calibration function, which indicates the vertical position of the crankarm. The power meter provides accurate data in all weather conditions thanks to its automatic temperature compensation from -5°C to +50°C. As the power meter transmits both an ANT+ and a Bluetooth signal, it can be paired with most bike computers. If you are not sure whether your bike computer or sports watch is compatible, take its user manual and look up whether it is ANT+ or Bluetooth compatible and power meter compatible.

• Weight: 10 grams
• Connectivity: ANT+, Bluetooth
• Accuracy deviation: ± 2%
• Power supply: rechargeable Li-Po 110 mAh battery
• Water and dust resistance rating: IP67
• Active temperature compensation
• Power measurement range: 20 - 2000 W
• Cadence range: 20 - 200 RPM

The crankarm fits perfectly on an Ultegra R8100 crankset but also on many other Hollowtech II cranksets. The other 12-speed cranksets (105 FC-R7100, Dura-Ace FC-R9200) have the exact same dimensions and can be used without modifications.

Although the crankarm also fits all other Shimano Hollowtech II cranksets, there are marginal differences in Q-factor. Q-factor means the distance between the outer edges of both crankarms. All 11-speed cranksets have a Q-factor of 146 millimetres, all 12-speed cranksets have a width of 148 millimetres. So it is recommended to buy a power meter from a crankset with the same number of gears.

• INPEAK Powercrank Ultegra R8100
• USB charging cable
• User manual
• Sticker set
• Device data card

Watch this video for more information on Inpeak's power meters.