16mm BaneBot Spur Gearmotors
These little 16mm spur gearmotors from BaneBots pack a pretty serious punch for the dollar. They boast a 600+RPM rating at no load with 1500ma. The 3mm shaft when supported by a pair of bearing blocks can rock out nearly a 5" wheel. Wonderful for small bots in the 5-10lb range. BaneBot products can be purchased directly from www.BaneBots.com or my personal favorite, Trossen Robotics (which needs no introduction).