The Tamiya single gearbox is essentially half of the Tamiya 70168 double gearbox. The kit can be built with gear ratios of 12.7:1, 38:1, 115:1, and 344:1. There are two possible output axle locations (for any given gear ratio, only one output location is possible).
Specs
Typical Operating Voltage: 3V
Gear Ration Options: 12.7:1, 38:1, 115:1, 344:1
No Load Speed at 3V: 12300 rmp
No Load Current at 3V: 150 mA
Stall Current at 3V: 2100 mA
Stall Torque at 3V: 0.5 oz-in.