Lego Technic and a large portion of tinkering skills make it possible: Youtuber Sleepy Cow builds a bike from Lego parts. The mini-bike features a sturdy frame and wheels, a functional chain drive with freewheel and even a pneumatic disc brake. https://www.ride.ch/de/news/unglaublich-das-lego-velo-das-voll-funktioniert
