Choyimira mpira wamba chimakhala ndi njira zamkati ndi zakunja za mpikisano, zinthu zingapo zozungulira zomwe zimalekanitsidwa ndi chonyamulira, ndipo, nthawi zambiri, zishango ndi/kapena zosindikizira zomwe zimapangidwa kuti zisalowe dothi ndi mafuta. Zikayikidwa, mpikisano wamkati nthawi zambiri umakanikizidwa pang'ono pa shaft ndipo mpikisano wakunja umakhala m'nyumba. Mapangidwe alipo ogwiritsira ntchito katundu woyera wa radial, katundu woyera wa axial (thrust), ndi katundu wophatikizana wa radial ndi axial.

Ma bearing a mpira amafotokozedwa kuti ali ndi malo olumikizirana; kutanthauza kuti, mpira uliwonse umalumikizana ndi mpikisano pang'ono kwambiri - mfundo, m'malingaliro. Ma bearing apangidwa kotero kuti kusintha pang'ono komwe mpira umapanga pamene ukulowa ndi kutuluka m'dera lonyamula katundu sikupitirira malo opindulitsa a chinthucho; mpira wosatulutsidwa umabwerera ku mawonekedwe ake oyambirira. Ma bearing a mpira samakhala ndi moyo wopanda malire. Pomaliza pake, amalephera chifukwa cha kutopa, kutayika, kapena zifukwa zina zambiri. Amapangidwa motsatira ziwerengero ndi moyo wothandiza pomwe nambala inayake ikuyembekezeka kulephera pambuyo pa kuchuluka kwa ma revolutions.

Opanga amapereka ma radial bearing a mzere umodzi m'magulu anayi osiyanasiyana pamitundu yosiyanasiyana ya kukula kwa mabowo. Ma angular contact bearing apangidwa kuti azitha kupirira kunyamula kwa axial mbali imodzi ndipo amatha kuwirikiza kawiri kuti agwire kunyamula kwa thrust mbali ziwiri.

Kulinganiza kwa shaft ndi ma bearing kumakhala ndi gawo lofunika kwambiri pa moyo wa ma bearing. Kuti zikhale zosavuta kuzilumikiza, ma bearing odzigwirizanitsa okha amagwiritsidwa ntchito.

Kuti muwonjezere mphamvu ya radial-load, chonyamulira chonyamula katundu chimachotsedwa ndipo malo pakati pa mipikisano amadzazidwa ndi mipira yambiri momwe ingakwanire—chomwe chimatchedwa full-complement bearing. Kuwonongeka kwa ma bearing awa kumakhala kwakukulu kuposa omwe amagwiritsa ntchito zonyamulira chifukwa chokanda pakati pa zinthu zozungulira zomwe zili pafupi.
Mu ntchito zofunika kwambiri komwe kuthamanga kwa shaft kumakhala vuto—monga ma spindle a zida zamakina—ma bearing akhoza kuyikidwa kale kuti atenge malo aliwonse mu bearing assembly yomwe yakhala ikuloledwa kale.