From: $ 400 excl. tax

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

Besides being built-in with all LegExx, LegFlexx, kPulley2, kBox Pro and kBox Lite devices, the certified kMeter is also available for purchase as an add-on to the kBox Active and kPulley Go.

The kMeter system is developed specifically to accurately monitor power and energy as well as estimate force 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 and patients.

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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 kMeters that can be operated on the various Legacy kBox4 Active Platforms.

The latest kBox version of the kMeter can only measure flywheel rotations with the help of a magnetic sensor disc, which can be found on all Jet Black kBox Actives (including legacy models).

Whereas the previous iteration of the kMeter relies on a rubber sensor disc with spikes for accurate measurements, and these sensors can be found on all other legacy platforms (Desert Bronze, Carbon Black, Arctic Blue, Frosty Green).


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)