Especially on the 24" and 26" sizes we recommend to check what your usage is. Luxus unicycles are recommended up to 75 kgs with normal usage. Children could also do more - but for serious use or heavy riders, we recommend an axle with ISIS or Q-Axle axle like for example the QU-AX Profi BB.
OnlyOne and QU-AX unicycles with square taper axle are designed for children and beginners up to approx. 75 kgs. For heavier riders or for advanced use (like jumping, freestyle, hockey, basketball etc.) we strongly recommend a unicycle with stronger ISIS or Q-Axle hub like the QU-AX Profi or Muni series.