# Solarbotics GM2 224:1 Gear Motor Offset Output **Type:** Product page · **SKU:** POLOLU-180 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/solarbotics-gm2-224-1-gear-motor-offset-output.html ([markdown](https://core-electronics.com.au/solarbotics-gm2-224-1-gear-motor-offset-output.html.md)) ## Retired product This product is retired and no longer available for purchase. Search the catalogue for an alternative. ## Description This 224:1 gearmotor (gearbox with brushed DC motor) is a great low-cost alternative to modified hobby servos or [Tamiya gearboxes](https://core-electronics.com.au/category/34/tamiya-motors-and-gearboxes). The low-current motor is a perfect match for Pololu's [qik 2s9v1 dual serial motor controller](https://core-electronics.com.au/pololu-qik-2s9v1-dual-serial-motor-controller.html), and the compact size makes this unit an attractive choice for small robot designs. This gearmotor comes pre-assembled, with the gears fully enclosed. There are built-in mounting holes, and the output shaft is 7mm in diameter with two sides flattened (the “D” output is not meant to be used). A built-in safety clutch engages at approximately 60 oz-in. Compatible products include a custom-molded [GMPW plastic wheel](https://core-electronics.com.au/solarbotics-gmpw-r-red-wheel.html), and the [Solarbotics GMW motor mount](https://core-electronics.com.au/solarbotics-gmw-gm2-3-8-9-gear-motor-mount-one-mount.html), which can be used as a wheel itself or as a mounting point for other wheels or mechanisms. Solarbotics makes a [mounting bracket](https://core-electronics.com.au/solarbotics-gmb28-gm2-gm8-gear-motor-bracket-laser-cut-steel.html) that works with this motor, and Pololu's [L-brackets](https://core-electronics.com.au/pololu-stamped-aluminum-l-bracket-pair-for-plastic-gearmotors.html) and [extended L-brackets](https://core-electronics.com.au/pololu-extended-stamped-aluminum-l-bracket-pair-for-plastic-gearmotors.html) for plastic gearmotors are also compatible with this motor (though you might need longer screws than the ones included with the Pololu brackets). For similar gearmotors, you might want to take a look at: - Less expensive: [Pololu 228:1 plastic gearmotor offset output](https://core-electronics.com.au/228-1-plastic-gearmotor-offset-output.html) - 90 degree output shaft: [GM3 gearmotor](https://core-electronics.com.au/solarbotics-gm3-224-1-gear-motor-90-deg-output.html). - Similar but smaller 120:1 gearmotor: [GM6 gearmotor](https://core-electronics.com.au/solarbotics-gm6-120-1-mini-gear-motor-offset-output.html) - Faster version: [GM8 gearmotor](https://core-electronics.com.au/solarbotics-gm8-143-1-gear-motor-offset-output.html) To increase the power of this gearbox, you can replace the motor with a higher-power [RM2 motor](https://core-electronics.com.au/solarbotics-rm2-high-power-motor-for-gm2-3-8-9.html). For a replacement motor, see the [RM3 motor](https://core-electronics.com.au/catalog/product/view/sku/POLOLU-604). **Specifications** - Description: Offset/inline - Gear ratio: 224:1 - 3 V Operation: - No-load RPM: ~ 24 - No-load current: ~ 40 mA - Stall current: ~ 400 mA - Stall torque: ~ 49 oz-in - 6 V Operation: - No-load RPM: ~ 46 - No-load current: ~ 50 mA - Stall current: ~ 710 mA - Stall torque: ~ 57 oz-in - Weight: 32 g | ![](https://a.pololu-files.com/picture/0J3699.600.png?9fc565f159285c59fcbbc9457c304b23) | |---| | Solarbotics GM2 gearmotor dimensions (in mm). | You can download a pdf version of this drawing with imperial dimensions (117k pdf) or metric dimensions (117k pdf). Though the product picture shows two gearmotors, this product is for a single motor. **People often buy this product together with:** | [![Solarbotics GM3 224:1 Gear Motor 90 deg. Output](https://a.pololu-files.com/picture/0J12.100.jpg?71698903576175acb4482b42ab6893f5)](https://core-electronics.com.au/solarbotics-gm3-224-1-gear-motor-90-deg-output.html) | [Solarbotics GM3 224:1 Gear Motor 90 deg. Output](https://core-electronics.com.au/solarbotics-gm3-224-1-gear-motor-90-deg-output.html) | |---|---| | [![Solarbotics GM8 143:1 Gear Motor Offset Output](https://a.pololu-files.com/picture/0J9.100.jpg?56bde8a25558a796a75a78442bc0dacd)](https://core-electronics.com.au/solarbotics-gm8-143-1-gear-motor-offset-output.html) | [Solarbotics GM8 143:1 Gear Motor Offset Output](https://core-electronics.com.au/solarbotics-gm8-143-1-gear-motor-offset-output.html) | |---|---| | [![Solarbotics GMW (GM2/3/8/9 Gear Motor Mount - ONE mount)](https://a.pololu-files.com/picture/0J2459.100.jpg?1101d7645e2d89608b7a8b48e68d5e0a)](https://core-electronics.com.au/solarbotics-gmw-gm2-3-8-9-gear-motor-mount-one-mount.html) | [Solarbotics GMW (GM2/3/8/9 Gear Motor Mount - ONE mount)](https://core-electronics.com.au/solarbotics-gmw-gm2-3-8-9-gear-motor-mount-one-mount.html) | |---|---| **Dimensions** | Size: | 48.2 × 44.8 × 22.7 mm[1](https://core-electronics.com.au/#note1) | |---|---| | Weight: | 32 g | **General specifications** | Gear ratio: | 224:1 | |---|---| | No-load speed @ 6V: | 46 rpm | | No-load current @ 6V: | 50 mA | | Stall current @ 6V: | 710 mA | | Stall torque @ 6V: | 57 oz·in | | No-load speed @ 3V: | 24 rpm | | No-load current @ 3V: | 40 mA | | Stall current @ 3V: | 400 mA | | Stall torque @ 3V: | 49 oz·in | **Notes:** 1See drawing for detailed dimensions. **Documentation and other information** - ![](https://a.pololu-files.com/picture/0J375.100.jpg?cba8580a0650ce6b6d335599dd589be9)**Comparison of Solarbotics Gearmotors (GM Series)** Table comparing specifications for the Solarbotics GM motors that Pololu carry. **File downloads** - **GM2 performance datasheet (165k pdf)** - **Dimensions (in) (117k pdf)** Dimension diagram for the Solarbotics GM2 gearmotor in inches. - **Dimensions (mm) (117k pdf)** Dimension diagram for the Solarbotics GM2 gearmotor in millimeters. ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/s/o/solarbotics_gm2_224_1_gear_motor_offset_output__pololu_180__00.jpg)