Apẹrẹ itọsi abẹfẹlẹ meji, ni akawe si abẹfẹlẹ kan, pese ṣiṣan atẹgun diẹ sii, dinku ariwo, ati dinku isonu afẹfẹ.Gear ọpa apẹrẹ, ko rọrun lati ṣii, ṣetọju ṣiṣan afẹfẹ ti o wa titi
Apẹrẹ itọsi abẹfẹlẹ meji, ni akawe si abẹfẹlẹ kan, pese ṣiṣan atẹgun diẹ sii, dinku ariwo, ati dinku isonu afẹfẹ.Gear ọpa apẹrẹ, ko rọrun lati ṣii, ṣetọju ṣiṣan afẹfẹ ti o wa titi