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Full machine-readable index: https://core-electronics.com.au/llms.txt # Solarbotics GM8 143:1 Gear Motor Offset Output **Type:** Product page · **SKU:** POLOLU-187 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/solarbotics-gm8-143-1-gear-motor-offset-output.html ([markdown](https://core-electronics.com.au/solarbotics-gm8-143-1-gear-motor-offset-output.html.md)) ## Retired product This product is retired and no longer available for purchase. Search the catalogue for an alternative. ## How to buy - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description This 143:1 gearmotor (gearbox with brushed DC motor) is a faster version of the [GM2 gearmotor](https://core-electronics.com.au/solarbotics-gm2-224-1-gear-motor-offset-output.html). It 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 7 mm in diameter with two sides flattened. **Please note that the output shaft is slightly shorter than on the [GM2](https://core-electronics.com.au/solarbotics-gm2-224-1-gear-motor-offset-output.html) and [GM3](https://core-electronics.com.au/solarbotics-gm3-224-1-gear-motor-90-deg-output.html) gearmotors.** Also, the green end of the output shaft should not be used (it is difficult to get to, anyway). This motor also comes with a built-in safety clutch. 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 120:1 plastic gearmotor offset output](https://core-electronics.com.au/120-1-plastic-gearmotor-offset-output.html) - Higher torque: [GM2 gearmotor](https://core-electronics.com.au/solarbotics-gm2-224-1-gear-motor-offset-output.html) - 90 degree output shaft: [GM9 gearmotor](https://core-electronics.com.au/solarbotics-gm9-143-1-gear-motor-90-deg-output.html) - Smaller: [GM6 gearmotor](https://core-electronics.com.au/solarbotics-gm6-120-1-mini-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: 143:1 - 3 V Operation: - No-load RPM: ~ 40 - No-load current: ~ 50 mA - Stall current: ~ 400 mA - Stall torque: ~ 44 oz-in - 6 V Operation: - No-load RPM: ~ 78 - No-load current: ~ 52 mA - Stall current: ~ 700 mA - Stall torque: ~ 76 oz-in - Weight: 32 g | ![](https://a.pololu-files.com/picture/0J3703.600.png?756573c0b5d4cf821cda72487ca27229) | |---| | Solarbotics GM8 gearmotor dimensions (in mm). | You can download a pdf version of this drawing with imperial dimensions (118k 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:** | [![Tamiya 70144 Ball Caster Kit (2 casters)](https://a.pololu-files.com/picture/0J263.100.jpg?fc176b970195fb7897949600595433ae)](https://core-electronics.com.au/tamiya-70144-ball-caster-kit-2-casters.html) | [Tamiya 70144 Ball Caster Kit (2 casters)](https://core-electronics.com.au/tamiya-70144-ball-caster-kit-2-casters.html) | |---|---| | [![Solarbotics GM2 224:1 Gear Motor Offset Output](https://a.pololu-files.com/picture/0J6.100.jpg?ce207f70ea09711defeb8caa251fa836)](https://core-electronics.com.au/solarbotics-gm2-224-1-gear-motor-offset-output.html) | [Solarbotics GM2 224:1 Gear Motor Offset Output](https://core-electronics.com.au/solarbotics-gm2-224-1-gear-motor-offset-output.html) | |---|---| **Dimensions** | Size: | 48.2 × 46.9 × 22.7 mm[1](https://core-electronics.com.au/#note1) | |---|---| | Weight: | 32 g | **General specifications** | Gear ratio: | 143:1 | |---|---| | No-load speed @ 6V: | 78 rpm | | No-load current @ 6V: | 52 mA | | Stall current @ 6V: | 700 mA | | Stall torque @ 6V: | 76 oz·in | | No-load speed @ 3V: | 40 rpm | | No-load current @ 3V: | 50 mA | | Stall current @ 3V: | 400 mA | | Stall torque @ 3V: | 44 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** - **GM8 performance datasheet (164k pdf)** - **Dimensions (in) (118k pdf)** Dimension diagram for the Solarbotics GM8 gearmotor in inches. - **Dimensions (mm) (117k pdf)** Dimension diagram for the Solarbotics GM8 gearmotor in millimeters. - **GM8 Solidworks files (1MB zip)** ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/s/o/solarbotics_gm8_143_1_gear_motor_offset_output__pololu_187__00.jpg)