Muaj ob lub ntsiab ntawm spur iav: sab nraud thiab sab hauv.Cov iav sab nrauv muaj cov hniav txiav rau sab nrauv ntawm lub tog raj kheej.Ob lub iav sab nraud mesh ua ke thiab tig mus rau qhov sib txawv.Hauv qhov sib piv, cov iav sab hauv muaj cov hniav txiav rau sab hauv ntawm lub tog raj kheej.Cov iav sab nraud yog sab hauv lub iav sab hauv, thiab cov iav tig mus rau tib qho kev taw qhia.Vim hais tias cov iav shafts yog positioned nyob ze ua ke, lub puab iav los ua ke yog ntau compact tshaj lub sab nrauv iav los ua ke.Cov iav sab hauv yog siv rau kev sib kis ntawm cov iav planetary.

Spur iav feem ntau suav hais tias tsim nyog rau cov ntawv thov uas yuav tsum tau txo qis thiab sib npaug ntawm lub zog, xws li cov pob zeb thiab cov khoom siv crushing.Txawm hais tias muaj suab nrov, kev siv ceev ceev rau spur iav suav nrog cov khoom siv xws li tshuab ntxhua khaub ncaws thiab tshuab ntxhua khaub ncaws.Spur iav muaj ntau yam kev siv: lawv siv los nce lossis txo qhov ceev ntawm ib yam khoom, lawv kuj tuaj yeem siv los ua kom nce lossis txo lub zog los yog lub zog ntawm ib yam khoom tshwj xeeb.Txij li cov spur iav kis cov lus tsa suab thiab lub zog los ntawm ib tus ncej mus rau lwm qhov hauv cov qauv siv tshuab, lawv kuj tsim nyog rau cov tshuab ntxhua khaub ncaws, tov khoom, tshuab ziab khaub ncaws, siv tshuab, roj twj, thiab lwm yam.