No-spoke cycles

http://www.yankodesign.com/2010/08/13/no-spokes-cycle
http://www.wired.com/autopia/2013/05/loopwheel/

http://www.tuvie.com/nulla-minimalist-and-stylish-bike-concept/
http://limewedge.net/no-spoke-wheels-bike-concept
http://bicycling.about.com/od/bikemaintenance/a/spoke_problems.htm

Video
http://www.youtube.com/watch?v=RtmdD3FlSd8