Mini bike building is a growing community. Just take a look at the Redditor who made a mini bike using just Harbor Freight tools. Thene there's the Mega Moto 212, which has been an industry mainstay.
If your kid is a motorbike enthusiast, then you will probably want to get him/her a safe and powerful bike. With so many models in the industry to choose from, you may end up getting the wrong bike.
Ebike conversion kit company Boost has released its first-ever bike, simply called the Mini-Bike. The new miniature city bike takes inspiration from Boost’s work on its Brompton conversion kit.