These are some of the smallest gearmotors we've found, nice durable quality too!

High quality all-metal gears. The entire motor with gears weighs only .3 ounces!  They are rated for 4.5V DC, but we have tested and run them at 9.0V, even up to 12V. Tires can be directly mounted to the 3 mm diameter output 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!
 

Specifications at 4.5V:	17:1 - KG17
Typical operating voltage	1.7-5.0VDC
No load speed	300 rpm
No load current	90 mA
load current	260mA MAX
Starting torque	2.0 oz-in
True gear ratio	17:1
Shaft Size	3.0mm diameter, 4.5mm long with flat
Size	0.47" x 0.39" x 0.94"
Weight	8.2 grams (0.29 oz)

Dimensions

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