http://www.cyclekarts.com/
CycleKarts are small, lightweight, nimble machines made by their drivers for the pursuit of motoring sport. They're not serious speed-machines or status-generating show cars. They're purely for the gritty fun and satisfaction of tearing around in a machine you've built yourself.
As a class of driving machine, the CycleKart formula limits certain aspects of the machines (for reasons we elaborate on elsewhere) to maintain good sporting performance without jeopardising the light-hearted nature of these machines. CycleKarts and their builder/drivers don't like to take things too seriously, and certainly not themselves or each other, so overzealous competitiveness is frowned upon, and a win-at-any-cost attitude is not invited back. We do encourage good, sporting competitions for fun, to which end the cars are kept reasonably similar in performance.