Iibheringi ze-roller ezijikelezayo zineebheringi ezinamagqabi amile okweqonga ahlanganisene phakathi kweringi yangaphakathi enemikhondo emibini yomdyarho kunye nomsesane wangaphandle onemiqolo ejikelezayo.
Iibheringi ze-roller ezijikelezayo zinemiqolo emibini yeeroller, ikakhulu ezithwala imithwalo yeeradial, kodwa inokuthwala imithwalo yezihlunu nakweliphi icala.
Inomthamo ophakamileyo womthwalo, ngokukodwa ofanele ukusebenza phantsi komthwalo onzima okanye umthwalo wokungcangcazela, kodwa awunakuthwala umthwalo we-axial ococekileyo. Umjikelo weringi engaphandle yolu hlobo lokuthwala ungqukuva, ke ulungelelwaniso lwentsebenzo yalo lulungile kwaye lunokuhlawula impazamo yokuhlangana.
