Spur Gears yog tus nqi siv ntau hom iav .Lawv yog charcterze los ntawm cov hniav uas yog perpendicular o lub ntsej muag ntawm lub iav .Spur iav yog nyob deb ntawm cov feem ntau muaj, thiab feem ntau yog qhov kim tshaj plaws .Qhov yooj yim piav qhia geomety rau lub iav spur. yog qhia hauv daim duab hauv qab no.