Amotar karfe dabaranwani ɓangaren ƙarfe ne mai siffar ganga, mai ɗaure a tsakiya na taya wanda ke goyan bayan taya a cikin bayanan martaba. Har ila yau, an san su da rims, rims, ƙafafun, kararrawar taya. Hub bisa ga diamita, nisa, hanyoyin yin gyare-gyare, nau'ikan kayan daban-daban. Girman Hub shine diamita na cibiya, sau da yawa muna jin mutane suna cewa cibiya mai inci 15, cibiya mai inci 16 irin wannan bayanin, wanda inci 15,16 yana nufin girman cibiyar. Gabaɗaya a cikin mota, idan girman hub ɗin motar yana da girma kuma daidaitaccen rabo na taya yana da girma, yana iya yin tasirin tashin hankali sosai akan hangen nesa, kuma kwanciyar hankali na sarrafa abin hawa zai ƙara ƙaruwa, amma sai a sami ƙarin matsalolin ƙara yawan amfani da mai. Akwai manyan ma'auni da yawa a cikin injin injin, a cikin aiki dole ne a kula da sarrafa sigogi a cikin kewayon da ya dace, in ba haka ba zai shafi tsari da aikinKarfe Rim Wheel.