From the Wikipedia:
"A bicycle cooperative ("bike coop"), bicycle co-operative ("bike co-op"), bike kitchen, or community bike shop is a non-profit assisted-service bicycle repair shop. Precise definition of these terms is difficult, since some charge fees, all have slightly different goals, and diverse histories. Generally they are not-for-profit organizations or social enterprises.
Individuals bring in bicycles needing repair or maintenance; volunteers teach them how to do the required steps.[clarification needed — see talk] The users learn repair skills which are useful both for breakdowns on the road and for at-home repairs. Co-ops also sell new and used bike parts and a few charge for repairs. In addition, they may provide other services, such as selling refurbished bikes and offering formal group bike-repair classes." (http://en.wikipedia.org/wiki/Bicycle_cooperative)