Kuyenda komwe kumaperekedwa ndi jenereta yamagetsi ya chofukula kumapita ku maulalo a njanji kudzera mu mota yothamanga ndi mkombero wa sprocket. Mano a mkombero wa sprocket ayenera kugwirizana bwino ndi chofukula cha njanji ndikutha kuchiyendetsa bwino. Izi ziyenera kukhala choncho ngakhale chofukulacho chikutambasuka chifukwa cha kuwonongeka kwa pini ndi bushing yake. Nthawi zambiri, mkombero wa sprocket umakhala kumbuyo kwa zida zoyendetsera za chofukula.
