Mawilo a mbale amathandizira kudziwa momwe tchenichi chimagwirira ntchito komanso moyo wake wautumiki, motero GL imapereka mawilo ofananira ndi mbale kuchokera pakuchulukira kwa maunyolo onse.Izi zimatsimikizira kugwirizanitsa koyenera pakati pa unyolo ndi mawilo a mbale ndikuletsa kusiyana koyenera komwe kungakhudze moyo wonse wa chain drive.