Pali mitundu iwiri ikuluikulu ya ma spur magiya: akunja ndi amkati.Magiya akunja ali ndi mano odulidwa kunja kwa silinda.Magiya awiri akunja amalumikizana pamodzi ndikuzungulira molunjika.Mosiyana ndi zimenezi, magiya amkati ali ndi mano odulidwa mkati mwa silinda.Zida zakunja zili mkati mwa zida zamkati, ndipo magiya amazungulira mbali imodzi.Chifukwa ma shaft amagiya amayikidwa moyandikana, gulu lamkati la zida zamkati ndi lophatikizika kwambiri kuposa gulu lakunja la zida.Magiya amkati amagwiritsidwa ntchito kwambiri pofalitsa zida za pulaneti.

Magiya a Spur nthawi zambiri amawonedwa ngati oyenera kugwiritsa ntchito zomwe zimafuna kuchepetsa liwiro komanso kuchulutsa ma torque, monga mphero za mpira ndi zida zophwanyira.Ngakhale pali phokoso lalikulu, ntchito zothamanga kwambiri zamagiya a spur zimaphatikizapo zida zogula monga makina ochapira ndi zosakaniza.Magiya a Spur ali ndi ntchito zosiyanasiyana: amagwiritsidwa ntchito kukulitsa kapena kuchepetsa liwiro la chinthu, amathanso kugwiritsidwa ntchito kukulitsa kapena kuchepetsa torque kapena mphamvu ya chinthu china.Popeza ma giya a spur amasamutsa kusuntha ndi kukakamiza kuchokera kutsinde limodzi kupita ku lina mwamakina, ndi oyeneranso kumakina ochapira, zosakaniza, zowumitsira, makina omanga, mapampu amafuta, ndi zina zambiri.