This 224:1 gearmotor is very comparable to a hobby servo for power, at a fraction of the cost!
Solarbotics is the sole commercial outlet for these impressive 224:1 gearmotors. They are very comparable to a hobby servo for power, at a fraction of the cost!
Based on the original design by Mark Tilden for use in the B.I.O.Bugs & RoboSapien, these motors are the next generation with a variety of improvements such as dual output shafts and a lower current motor.
Check out this quick tutorial for how to modify the GM2 from a torquey slow 224:1 ratio to a speedy 14:1 ratio.
Do you need to mount something to the shaft of the motor? Try the GMW - it's a very effective platform for a variety uses. Alternatively, you'll also find that a #2x1/4" SMS screw will provide a snug fit for your need.
(Motors are sold individually, wheels are not included)