From: $ 400 excl. tax

The Exxentric kMeter is our wireless science-based feedback system for flywheel training.

The certified kMeter system accurately monitors power and energy while providing force estimates of during strength training on select models in our series of Flywheel Training equipment. It is used by coaches and physiotherapists as well as directly by athletes & patient and is already built-in with all LegExx, LegFlexx, kPulley2, kBox Pro and kBox Lite devices.

The kBox ActiveCompatibility with kMeter clarified here and kPulley Go can be easily enhanced with a kMeter feedback system during assembly by our technicians or in the convenience of your own home.

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The kMeter for the kPulley Go is compatible with all kPulley Go devices, while there is an important distinction between the type of kMeters that can be operated on existing and previous versions of the kBox4 Active.

The latest kBox version of the kMeter detects flywheel rotations through a magnetic sensor, which can be found on all Jet Black kBox Actives (including the available legacy model).

Whereas the previous iteration of the kMeter collects accurate measurements through a rubber sensor disc with spikes, which can be found on all other no longer available legacy platforms (Desert Bronze, Carbon Black, Arctic Blue, Frosty Green).

Please remember to verify the type of sensor disc on your kBox prior to placing an order by safely flipping your kBox over and inspecting underneath the shaft cover.


The system measures flywheel rotations wirelessly with high accuracy at rotational speeds of 155 revolutions per second and at a sample rate of 10000 Hz it receives 64 impulses per revolution. This all gets processed in real-time into a smartphone app with a simple and accessible interface to present key training results, including:

  • Concentric and eccentric power
  • Range of motion
  • Force
  • Eccentric overload
  • Energy expenditure

The kMeter system consists of two parts: the wireless transmitter connected to the flywheel training device and its corresponding app.

Exxentric App

The Exxentric App can be downloaded for free and installed by every user of a LegExx, LegFlexx, kPulley2, kPulley Go or kBox equipped with the kMeter hardware. Users can monitor the results directly on their mobile devices and are able to save, browse, share or even export for analysis.

Read more and download the app here. Further supporting material can be found here.

Additional information


kBox Pro, kBox Lite, kPulley2, LegExx, LegFlexx

Available as add-on for

kBox Active, kBox4 Active (Legacy), kPulley Go

Sample rate

10000 Hz (155 revolutions/second)