They're conical pulleys with variable diameters. The motor powers the input pulley although the output pulley sends electricity for the wheels by means of possibly a driveshaft or CV shafts. You puuuulllll pull the toy backwards plus the engine tightens…..this means you pull it back again…hold it…and “Enable it Go!” https://gearbox-cvt65319.bloggip.com/32748190/top-latest-five-gearbox-cvt-urban-news