The default kit comes with everything you need as long as the adult's bike has a quick-release rear axle, and the kid's bike has a nutted front axle.

• The adult's bike must have a 24-29" rear wheel, and the kid's bike must have a 12-20" wheel.
• There is a total combined weight of the child and their bicycle of 42kg.

However, if the specs of your bike or the childs bike are different, you may need the following:

• If the adult's bike has a thru-axle, a separate adapter is required, specific to the thru-axle.
• If the adult's bike has a solid axle, a separate adapter is required.
• If the child's bike has a quick-release axle, a separate adapter is required.