This 120:1 brushed DC gearmotor is very compact and weighs only 0.7 ounces (20 grams) — perfect for building a quick, miniature robot.

This gearmotor starts rotation at 0.58 V, drawing only 46.5 mA at 7 RPM. At 5 V, the gearbox and motor provide 20 oz-in of torque and 145 RPM. The free-running current is 88 mA, and the stall current is 610 mA. The low-current motor is a perfect match for our qik 2s9v1 dual serial motor controller.

This gearmotor comes pre-assembled, with the gears fully enclosed. A clutch limits the output torque to approximately 25 oz-in (which is produced at 6.5 V, drawing 650 mA) to protect the gearbox and motor. The unit has one mounting hole, and the chrome-finish output shaft is splined with a 0.08" (2 mm)-crest diameter.

A custom plastic wheel is available for this gearmotor, as well as a LEGO wheel adapter that allows it to be used with a variety of LEGO wheels.

For a similar, less expensive version of this gearmotor, see the Pololu 120:1mini plastic gearmotor offset output. For a version of this gearmotor with a 90 degree output shaft, see the GM7 gearmotor. For a similar but larger gearmotor, see the GM2 gearmotor (224:1) and the GM8 gearmotor (143:1).


  • Description: Mini offset/inline
  • Gear ratio: 120:1
  • 3 V Operation:
    • No-load RPM: ~ 64
    • No-load current: ~ 64 mA
    • Stall current: ~ 325 mA
    • Stall torque: ~ 13.5 oz-in
  • 6 V Operation:
    • No-load RPM: ~ 157
    • No-load current: ~ 97 mA
    • Stall current: ~ 560 mA
    • Stall torque: ~ 21.1 oz-in
  • Weight: 18 g

Solarbotics GM6 gearmotor dimensions (in mm).

You can download a pdf version of this drawing with imperial dimensions (99k pdf) or metric dimensions (99k pdf).

Though the product picture shows two gearmotors, this product is for a single motor.



Size: 36.5 × 27.5 × 25.0 mm1
Weight: 18.00 g

General specifications

Gear ratio: 120:1
Free-run speed @ 6V: 157 rpm
Free-run current @ 6V: 97 mA
Stall current @ 6V: 563 mA
Stall torque @ 6V: 21 oz·in
Free-run speed @ 3V: 64 rpm
Free-run current @ 3V: 64 mA
Stall current @ 3V: 326 mA
Stall torque @ 3V: 14 oz·in


See drawing for detailed dimensions.


Documentation and other information

Comparison of Solarbotics Gearmotors (GM Series)

Table comparing specifications for the Solarbotics GM motors that we carry.

File downloads

GM6 performance datasheet (161k pdf)
Dimensions (in) (99k pdf)
Dimension diagram for the Solarbotics GM6 gearmotor in inches.
Dimensions (mm) (99k pdf)
Dimension diagram for the Solarbotics GM6 gearmotor in millimeters.


SKU PL-182
Brand Solarbotics

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