Hanyar tushen ganewa:
Akwai nau'ikan manyan sarƙoƙin watsawa guda biyu kawai da manyan sprockets don babura, 420 da 428. Ana amfani da 420 gabaɗaya a cikin tsofaffin samfura tare da ƙananan ƙaura, kuma jikin yana ƙarami, kamar farkon 70s, 90s da wasu tsofaffin samfuran.Kekunan katako masu lanƙwasa, da sauransu. Yawancin babura na yau suna amfani da sarƙoƙi 428, kamar yawancin kekuna masu lanƙwasa da sabbin kekuna masu lanƙwasa.
Sarkar 428 a fili tana da kauri da fadi fiye da sarkar 420.Yawancin lokaci akwai alamomi 420 ko 428 akan sarkar da sprocket.Sauran XXT (inda XX lamba ce) tana wakiltar adadin haƙoran sprocket.
Lokacin aikawa: Oktoba-09-2023