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) would ...
I stumbled on my fixie through a London-based forum ... wearing out slightly quicker it would on a normal bike but, hey, neither of these parts will cost me more than £30 and a Saturday afternoon!