22 mm planetary gear motor - The gear motors are available in 2-, 3- and 4-stage versions, and gear ratios range from 19:1 up to 809:1. Currently nine different gear ratios in 12V and 24V versions are in stock, ready to ship. With these versions, torque values of 150 to 800 mNm can be achieved. The gears are made entirely of plastic and run very smoothly.