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 x 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 x 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 x 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 x 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 x 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 x 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 x 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 x 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 x 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

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