The Solarbotics GM17 High Efficiency Gear Motor has a 228:1 ratio gearbox for plenty of torque.
This is a power efficient motor that still has a good amount of torque to get your robot project moving. It also has a shaft which is compatible with the Solarbotics Gear Motor Wheels making this an ideal solution for small battery powered robots. The shaft measures 7mm in diameter and has two flat sides.
|Motor Voltage||3-9 V|
|No-Load Current at 3V||16 mA|
|No-Load Speed at 3V||12 RPM|
|Stall Current at 3V||253 mA|
|Stall Torque at 3V||3.14 kg-cm (43.6 oz-in)|
|No-Load Current at 6V||24 mA|
|No-Load Speed at 6V||30.6 RPM|
|Stall Current at 6V||492 mA|
|Stall Torque at 6V||6.0 kg-cm (83.5 oz-in)|
|No-Load Current at 9V||38 mA|
|No-Load Speed at 9V||46.9 RPM|
|Stall Current at 9V||738 mA|
|Stall Torque at 9V||7.6 kg-cm (105.3 oz-in)|