Advanced Flywheel Knob

$ 120 excl. tax


With one simple piece you can enhance the inertia capacity of your flywheel training device by either 0.100 kgm² or 0.140 kgm² (i.e. by up to 2 compatible flywheels), which expands the inertia range up to 0.420 kgm² on the kBox Pro & SingleEx machines, 0.300 kgm² on the kBox Lite, 0.280 kgm² on the kPulley2 and up to 0.200 kgm² on the kBox Active.

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The Advanced Flywheel Knob is intended for use with any kPulley2, SingleExx and most kBox4 devices, allowing your muscles to produce higher forces during training. Unlike the speedy movements in any explosive or ballistic training methods, with a higher inertia the motion of your drills will be slower and more controlled. This Flywheel Knob can be particularly useful for strongmen, powerlifters and weightlifters among other similar type of athletes.


The Advanced Flywheel Knob is minimal in size, weighing just only 250 g, made out of anodized aluminium.

Using it to secure the flywheels on your flywheel training device is just as simple as using the original Flywheel Knob that comes with your equipment. However when the device is loaded to the maximum flywheel capacity (either 4 or 6) we advise you to keep one hand on the flywheels when removing this Knob to prevent the flywheels from bouncing off.

If you want to enhance your flywheel training with the Advanced Flywheel Knob we would recommend also considering the following items as additions to your tool box:

  • One or two extra flywheels
    • Size L or XL depending on the equipment you have.
  • Harness
    • For maximal power development in squat variations.
  • kBar
    • Lightweight and durable design for intense deadlift variations.
  • kMeter (for kBox4 Active owners)
    • Provides real time and historical feedback to help program your training and achieve better results.


Size (diameter x height)

5.25 x 4.25 cm


250 g

Additional Inertia Capacity

0.100 – 0.140 kgm² (i.e. up to 2 compatible flywheels)


kBox4 (since May 2018), , LegExx, LegFlexx, kPulley2 and kPulley1

SKU 91115