Using the existing ISIS type 20 inch unicycle (Nimbus 20" or Profi 20")
It is an extension bar that connects the wheelset required when making a 2-wheel or 3-wheel unicycle.
Since ISIS housing is used, it can be basically used only for ISIS type hubs and bearings.
Components: 2 extension bars (left/right), 2 housings (left/right)
*However, wheelsets are not included and must be purchased separately.