[Maciej Nowak] demonstrates just how to produce your own gears with a homemade cutting tool. The cutting tool for the job is an M16 machine tap, chosen for the smaller flutes compared to a hand tap.
A quick definition: A fixed-gear bicycle (or fixie), like the very first safety bicycles introduced in 1885 by John Kemp Starley in Coventry, England, is the simplest and, some (like me ...