Sarkar jigilar kaya iri ɗaya ce da sarkar jigilar kaya. Sarkar jigilar kaya daidai kuma ta ƙunshi jerin bearings, waɗanda aka gyara ta hanyar farantin sarkar tare da takurawa, kuma dangantakar matsayi tsakanin juna daidai take.

Kowace bearing ta ƙunshi fil da hannun riga wanda na'urorin juyawa na sarkar ke juyawa. Duk fil da hannun riga suna fuskantar taurarewa a saman, wanda ke ba da damar haɗin gwiwa masu hinged a ƙarƙashin matsin lamba mai yawa, kuma yana iya jure matsin lamba na kaya da na'urorin juyawa da tasirin ke watsawa yayin haɗuwa. Sarƙoƙin jigilar kaya masu ƙarfi daban-daban suna da jerin ramukan sarka daban-daban: ramukan sarka sun dogara ne akan buƙatun ƙarfi na haƙoran sprocket da buƙatun tauri na farantin sarka da sarka ta gaba ɗaya. Idan ya cancanta, ana iya ƙarfafa shi. Hannun riga na iya wuce ƙimar ramukan sarka, amma dole ne a sami gibi a cikin haƙoran gear don cire hannun riga.