Flywheel, kBox3 [discontinued]

$ 70 excl. tax

The Flywheels are an indispensable part of any flywheel training device. These flywheels are compatible with the kBox3 model, and are made from laser cut, balanced and powder coated carbon steel. The number and size of the flywheels used determine the inertia of the kBox training experience.

*We have a very limited amount of these flywheels left and they’re only available in 0.050 kgm²

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The force in a flywheel training exercise depends on a combination of the intensity you work with and the inertia. With a higher inertia, the motion will be slower and more controlled, and your muscle will be able to produce a higher force. With a lower inertia, the motion will be faster which also puts higher demands on skill, balance and technique.


The inertia resulting from the size and number of flywheels you select impacts the training adaption you get. Together with your workout intensity, the inertia chosen decides your Flywheel Workout Zone, which can include strength training, power training, eccentric overload and warming-up.

For guidance on how to mount a flywheel onto your kBox3, please watch our quick demonstration here.


The kBox3 can be equipped with up to four flywheels simultaneously.

The flywheels are available in three different sizes:

  • Large: 0.050 kgm2
  • Medium: 0.025 kgm2
  • Small: 0.010 kgm2

The average first-time user typically starts with one large flywheel for upper body exercises and sometimes two large flywheels for the lower body.

The medium and light flywheels can be used both on their own for high-speed exercises and weaker individuals (such as for rehabilitation), but they can also be used to fine-tune the inertia at higher loads.

Additional information


0.010 kgm², 0.025 kgm², 0.050 kgm²


kBox3, kBox2.5, kBox2