Kei te wātea ngā peera pōro riu hohonu i roto i ngā hoahoa radial me te axial mō ngā momo rerekē. Kei te wātea ngā peera pōro riu hohonu rarangi kotahi i roto i ngā hoahoa tuwhera me te hiri. He mea hanga ēnei mō ngā tere teitei ki te tino teitei, ā, ka taea te whakauru i ngā kaha radial me te axial. He rite ngā peera pōro riu hohonu rarangi rua ki ngā peera pōro riu hohonu rarangi kotahi i roto i te hoahoa, ā, ka whakamahia ina kore e ranea te kaha kawenga radial o ngā peera pōro riu hohonu rarangi kotahi. Kei te wātea ngā peera pōro riu hohonu axial i roto i ngā momo hoahoa kotahi, takirua rānei. He tino pai ēnei peera mō ngā kawenga axial teitei.
