Kugwiritsa ntchito kwambiri magwiridwe antchito omwe amagwirizana ndi zomangira zomwe zimatsatira utali wamkati wa mphete ya Irtia ndi kunja kwa hub, kugwiritsa ntchito zomata kwambiri ndikumachita zomangira zolimba. Amakhalanso ndi nthawi yolondola yolimbana ndi utoto wakuda. Chingwe cha stevel chomwe chimapangitsa kuti injiniyo ikhale ndi injini yogwedezeka ndikugwedezeka kwa msonkhano wozungulira pa pafupipafupi komanso rpm. Imawonjezera moyo wa crankshaft zomwe zimalola injini kuti ipange mphamvu zambiri ndi torque.
Kugwiritsa ntchito kwambiri magwiridwe antchito ambiri kumapangidwa mu chitsulo, ndipo ndioyenera kugwiritsa ntchito masewera olimbitsa thupi.
Mosiyana ndi oem okhazikika, hub ndi mphete imachotsedwa ntchito kuti mupewe kuyenda kwa mphete yakunja.
Ndi kuphatikiza kwa abwino komanso owoneka bwino, izi zimakweza bar m'misika yayitali.