Gisesengura isano iri hagati yubugari bwurukuta rwa radiyo ($ b $) hamwe nuburyo bwo kwishyiriraho impeta yimbere igumana impeta.

Kwishyiriraho imbaraga $ \ sigma_i $ yimpeta yimbere ibaho iyo ihagaritswe kugirango ihuze na bore. Irabarwa nka $ \ sigma_i = \ frac {E \ cdot b \ cdot (D_g - D_f)} {D_m ^ 2} $, aho $ D_g $ ni diameter ya groove na $ D_f $ ni diameter yubusa. Niba urukuta rwa radiyo $ b $ ari runini cyane, guhangayika mugihe cyo kwishyiriraho birashobora kurenga imipaka yoroheje, bikavamo 'gushiraho burundu'. Ibi bivuze ko impeta idashobora 'gusubira inyuma' mu gikoni, biganisha ku buryo bworoshye. Ibinyuranye, $ b $ ari nto cyane bigabanya ubushobozi bwo gutera. Igishushanyo kigomba kuringaniza ibyo ukoresheje 'igipimo cyo kwaguka', byemeza $ \ sigma_i <0.8 \ cdot S_y $ kugirango usubiremo.