Comparison of Solarbotics Gearmotors (GM Series)

Solarbotics provides a variety of gearmotors that are great for building small robots. The following table compares major features of the Solarbotics GM gearmotors we carry.

gear motor	size	weight	gear ratio	free-run RPM	free-run current	stall current	stall torque	clutch	output shaft	wheels
GM2 $6.00	55 × 48 × 23 mm 2.17 × 1.89 × 0.906 in	37 g 1.31 oz	224:1	38 rpm @ 5 V	52 mA @ 5 V	600 mA @ 5 V	50 oz * in @ 5 V	engages at ~60 oz * in	7 mm diameter two sides flattened	GMPW wheels
GM3 $6.00	70 × 22.5 × 37 mm 2.76 × 0.886 × 1.46 in	37 g 1.31 oz	224:1	38 rpm @ 5 V	52 mA @ 5 V	600 mA @ 5 V	50 oz * in @ 5 V	engages at ~60 oz * in	7 mm diameter two sides flattened	GMPW wheels
GM8 $6.00	55 × 48 × 23 mm 2.17 × 1.89 × 0.906 in	32 g 1.13 oz	143:1	70 rpm @ 5 V	57.6 mA @ 5 V	670 mA @ 5 V	43 oz * in @ 5 V	clutch included	7 mm diameter two sides flattened slightly shorter than GM2/GM3	GMPW wheels
GM9 $6.00	70.5 × 27 × 23 mm 2.78 × 1.06 × 0.906 in	32 g 1.13 oz	143:1	66 rpm @ 5 V	73.2 mA @ 5 V	670 mA @ 5 V	43 oz * in @ 5 V	clutch included	7 mm diameter two sides flattened slightly shorter than GM2/GM3	GMPW wheels
GM6 $5.75	37 × 21 × 27 mm 1.45 × 0.83 × 1.06 in	20 g 0.7 oz	120:1	145 rpm @ 5 V 7 rpm @ 0.58 V	88 mA @ 5 V 46.5 mA @ 0.58 V	610 mA @ 5 V	20 oz * in @ 5 V	engages at ~25 oz * in produced @ 6.5 V drawing 650 mA	2 mm-crest diameter splined	GM6/GM7 laser-cut wheels
GM7 $5.75	53 × 13 × 19 mm 2.09 × 0.51 × 0.75 in	20 g 0.7 oz	120:1	145 rpm @ 5 V 7 rpm @ 0.58 V	88 mA @ 5 V 46.5 mA @ 0.58 V	610 mA @ 5 V	20 oz * in @ 5 V	engages at ~25 oz * in produced @ 6.5 V drawing 650 mA	2 mm-crest diameter splined	GM6/GM7 laser-cut wheels
GM10 $11.00	1 × 0.56 × 1.14 in	5 g	81:1	370 rpm @ 5 V	24.6 mA @ 5 V	184 mA @ 5 V	3.6 oz * in @ 5 V	none	0.14-inch square	GM10 wheels
GM18 $19.75	29 × 10 × 12 mm 1.14 × 0.39 × 0.47 in	8.2 g 0.29 oz	30:1	566 rpm @ 6 V	48 mA @ 6 V	500 mA @ 6 V	7.29 oz * in @ 6 V	none	3 mm diameter	RW2 wheels
GM12a $19.75	29 × 10 × 12 mm 1.14 × 0.39 × 0.47 in	8.2 g 0.29 oz	100:1	170 rpm @ 6 V	48 mA @ 6 V	390 mA @ 6 V	10.7 oz * in @ 6 V	none	3 mm diameter	RW2 wheels
GM13a $19.75	29 × 10 × 12 mm 1.14 × 0.39 × 0.47 in	8.2 g 0.29 oz	150:1	113 rpm @ 6 V	40 mA @ 6 V	370 mA @ 6 V	14.97 oz * in @ 6 V	none	3 mm diameter	RW2 wheels
GM14a $19.75	29 × 10 × 12 mm 1.14 × 0.39 × 0.47 in	8.2 g 0.29 oz	298:1	71 rpm @ 6 V	50 mA @ 6 V	533 mA @ 6 V	30.7 oz * in @ 6 V	none	3 mm diameter	RW2 wheels
gear motor	size	weight	gear ratio	free-run RPM	free-run current	stall current	stall torque	clutch	output shaft	wheels