Some people see a bicycle chain and think, “Reliable. Efficient. Proven.” Others see it and think, “Absolutely not.”

Sergii Gordieiev from The Q took a bike, removed its chain entirely and replaced it with a fully 3D-printed gear drivetrain, transforming it into a single-speed contraption powered by plastic gears and raw determination.

This is the kind of project that exists purely because someone asked, “what if I did this?” and then ignored every sensible voice in their head. It’s clever, unnecessary, wildly impractical, and deeply satisfying to watch!