Somewhere on this forum, there are pics of a system that uses garage door rails, and lenghts of pipe with garage door rollers in them for an overhead racks.

S hooks were placed on the lenghts of pipe to accomodate different size bikes and bikes could be moved close together or apart as needed since the pipes were on rollers. It was a very cool system of storage.

Found the thread!!!!

http://www.bikeforums.net/showthread...age+door+rails