Comparison of Solarbotics Gearmotors (GM Series)

Icon for links to Solarbotics Gearmotor Comparison Table.

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