Amatirhethi amandla kwePCR (Passenger Car Radial) okanye amatirhethi amaphandle komuntu ezikhululekileyo zizihlelwa ngemibhalo yezincinci. Lamatirhethi yalayishwa ngephakamiso lomkhuhlane olungaphezulu, uluhlaza nokusenjani. Lokhu kufuneka kuhlala phakathi komhlaba, ukuze usenzo lwakwesokudla, nokuthi lokhu kulayishwa ngokubekwa kakhulu, uzokusenjisa nokukhathala kuzidinga zonke izigqirha zokugijima. Futhi, ngokuphi na ukuba kunoma umthwalo omncane wePCR, wonke umdlali uzoyibona iindlela zakho ezikhethekileyo nokusebenza ekupheleni. Ngokushesha nokuba kukhuluma nokuba kuhamba emfuleni noma ukuthi ungene kwindawo elilodwa lokugijima, amatirhethi aPCR azifinyelela indlela yokugijima ngokukhathalelanga, ngaphandle kokuthi kuneendlela ezinomsindo.