Robots
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This gearmotor is a miniature (0.94" x 0.39" x 0.47"), high-quality, high-power motor with 298:1 metal gearbox, similar to Sanyo's popular 12 mm gearmotors.
Robot MarketPlace - 298:1 Micro Geared Motor
Hobby Robot Rides a Bike the Old-Fashioned Way
The current generation of bicycle-riding robots (I'm talking about those crazy kids from Murata ) are extremely complicated, relying on giant gyroscopes and thick wheels to keep themselves upright even while stationary.
