N20 encoder motors! The first step in a robotics project is to get a motor spinning. Once you've done that you quickly learn that not all motors go the same speed, even if they are the same part number! There are always variations that relate to voltage, environment, and manufacturing changes. This motor has a magnetic wheel and two hall effect sensors already attached. Using this motor is a breeze, and it's a nice small motor as well, in the 'standard' N20 size. Available in various gearings at