This is truly the smallest gearmotor we've found, and it is top quality.

High quality all-metal gears with your choice of a very torquey 196.6:1 gear ratio, a faster, but less torquey, 75.7:1 ratio, or for high speed applications, the 50:1 model. 

The entire motor with gears weighs only .3 ounces!  They are rated for 5.0V DC, but we have tested and run them at 9.0V, even up to 12V. Many tires/wheels can be directly mounted to the 3 mm diameter output shaft. 

Please note that the shaft lenghts are different on these models. The 50:1 comes with a longer, 12mm long shaft, while the 75:1 comes with a stuybby 5mm shaft.

With these motors we will see a new evolution of tiny bots. YES, the prop adapter and aluminum hubs we sell will fit on these motors!