Tamiya 70103 Universal Gearbox Kit
 

Unlike the other gearboxes in Tamiya’s series, the universal gearbox has a thin metal frame, making it the smallest Tamiya gearbox.
The final two gears are metal, making for a tough output.
A worm gear allows for the high gear ratio options of 101:1, 269:1, and 719:1.
 

Tamiya 70103 universal gearbox has a thin, compact, metal frame, making it the smallest Tamiya gearbox.
The final two gears are metal, making for a tough output.
A worm gear allows for the high gear ratio options of 101:1, 269:1, and 719:1.
The main output shaft can be oriented in four different directions, and a small,
auxiliary output shaft turns perpendicularly to the main output shaft.

The output shafts are 3 mm hexagonal axles that are 10 cm (about four inches) from tip to tip.
The axles work with any of the Tamiya wheels we carry, giving you many options for your robot speed.
The low-voltage motors run on 3-6 volts and draw up to a few amps,
making them perfect candidates for the Pololu low-voltage dual serial motor controller and the DRV8833 motor driver carrier.
Motor overheating can be caused by excessive stalling, even at very low voltages.
We recommend that you use stall-detection sensors, or just watch your robot,
to make sure that it doesn’t stall for more than a few seconds at a time. For motor specs,
see the Mabuchi motor FA-130 (#18100) data sheet (58k pdf).
 

Note that you can replace this motor with a lower-current, higher-voltage version
if you want to use this gearbox with controllers such as the qik 2s9v1 dual serial motor controller,
TB6612FNG dual motor driver carrier, or Baby Orangutan B-328 robot controller.

To compare all Tamiya gear box kits, see the Tamiya Gearbox Gear Ratio Comparison.