Mini DC motors are lightweight motors like their smaller counterparts, micro DC motors, but they have larger motor diameters. Motors those have a diameter around 10mm and 20mm are generally classified as Mini DC motors. They generally have reduction gears to generate some torque for small robots or toys. 12mm DC motors, 15mm DC motors and 16mm DC motors are the most popular motors in this category.
Mini DC motors are great choices for small wheeled robots due to their high speeds and satisfactory rated torques. These motors are fascinating examples of balance in weight, rated torque and speed. Therefore they can be used in a variety of different robotic projects because of this high versatility.