Replace the Belt on kBox4

When the drive belt on your kBox4 is damaged and cannot be trimmed, it needs to be replaced. Here’s how to fix it.

If trimming the damaged parts of the belt leaves a remaining belt that is too short, the belt needs to be replaced. Follow this procedure for the kBox4:


Procedure: kBox4

  • Verify that you have a replacement belt, or purchase it here.
  • Remove the Belt from the shaft, flip kBox4 over, take out from the Belt Lock and unwind all the Belt from the take-up spool.
  • Detach the Belt from the take-up spool by disconnecting at the hook between the long and the short strand close to the spring. Make sure the short strand is fixated so the spring doesn’t unwind and loosen its tension [can damage the spring].
  • Attach new Drive Belt to the short strand at the hook.
  • Reassemble the Belt all the way back to the shaft in the reverse order from when you removed it. Attach the Belt to shaft after you are certain that the Pulley is connected and the Belt isn’t twisted.

PROCEDURE: kBox4 Lite (2016 model)

  • Verify that you have a replacement belt, or contact us to order.
  • Remove the Belt from the shaft, push Belt Lock Button and pull out all of the Belt.
  • Put the new Belt through the Belt Lock, attach the Pulley and attach to the shaft. Make sure the Belt isn’t twisted.




Contact us or your reseller for help, or go back to maintenance.


kBox4 Active

Our entry level model for the serious personal trainer or demanding home user. The perfect tool in strength and rehabilitation at our lowest price point.

  • Entry Level Model
  • Holds 1-2 Flywheels
  • kMeter Compatible
  • Weighs 15 kg
  • Starting at €1 410 / $1 635
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kBox4 Lite

Offers the lowest weight and best portability which makes it perfect for frequent travel without compromising the training.

  • Enhanced Portability
  • Holds 1-4 Flywheels
  • Built in kMeter
  • Weighs 9.5 kg
  • Starting at €2 300 / $2 665
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kBox4 Pro

Our premium kBox model with the greatest versatility and largest performance area. It’s ideal for sports teams, premium fitness clubs and physiotherapy facilities.

  • Largest Performance Area
  • Holds 1-4 Flywheels
  • Built in kMeter
  • Weighs 15.5 kg
  • Starting at €2 990 / $3 465
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The kPulley2 is the ideal horizontal solution for improving strength by offering flywheel training for rotational and pull exercises.

  • Horizontal Model
  • Holds 1-2 Flywheels
  • Built in kMeter
  • Easy to assemble
  • Starting at €1 890 / $2 190
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