Pimoroni Micro Metal Gearmotors with Extended Back Shaft - Pimoroni COM0801, This 298:1 ratio Micro Metal Gear motor from Pimoroni can achieve up to 75rpm and its small size makes it ideal for small robot platforms or other light mechanical loads.
It has a 3mm diameter D-shaped output shaft which is 9mm long and a 1mm diameter back shaft which is 4.
5mm long.
The back shaft is a great spot to install an encoder to track the motor's speed and position.
It is part of a range of motors that are all the same size allowing you to choose the one that's right for your next project.
Pimoroni COM0801 Micro Metal Gearmotor 298:1 Extended Back Shaft