The mini-motor gearbox kit from Tamiya makes it easy to get a small robot or plastic model moving. The kit includes one motor and all the gears and parts to build any of the eight possible gear ratio configurations. The eight gear ratio options give you the flexibility to choose the best speed and torque for your project. There are two possible output axle locations (only one output location is possible for any given ratio).
50.3 x 18 x 20mm
60mm shaft (3mm hex)
Operating Voltage: 3V
Ratio options: 7.5:1, 9.5:1, 15.7:1, 19.9:1, 32.9:1, 41.8:1, 79.0:1, 87.9:1
No-load Speed at 3V: 8400 rmp
No-load Current at 3V: 60 mA
Stall Current at 3V: 600mA
$12.99 
