This 50:1 ratio Micro Metal Gear motor from Pimoroni can achieve up to 420rpm 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.
