DC Gearmotors can be integrated into any DC motor design and the selected gear type will play key role in determining characteristics such as backlash, efficiency, maximum torque output, and reduction ratios. DC gearmotors use a gearbox (or gear reducer) to convert the rotary motion of a motor by increasing the torque output and decreasing the rotational speed by a specified ratio. DC gearmotors have two standard gearing systems: spur and planetary gearheads. Spur gearheads are relatively simple and inexpensive and will suit most needs in relatively low-torque applications. Planetary gearheads are generally specified for high-torque applications due to their design featuring multiple rotating gears that increase torque load-carrying capability. Brush and brushless DC gearmotors are available from stock.