Motoci ne ke tafiyar da ganga ta hanyar bel (ko sarkar) tsarin tuki kuma ana sarrafa saurin jujjuya shi ta hanyar mitar mai canzawa.
Tsarin tuƙi ya ƙunshi injin mai saurin canzawa, V-belt, (ko haɗawa), mai rage saurin motsin tsutsotsi & tsutsa, ƙaramar dabarar sarƙar (ko dabaran bel) da aka ɗora akan mashin mai rage saurin da kuma babbar dabaran sarkar (ko bel wheel) a kan drum.
Wannan tsarin tuƙi yana da fa'idodi na sauƙi a cikin aiki, ƙaramar amo, tsayayye da santsi a farawa & gudana da kulawa cikin ƙa'idodin saurin gudu.
1. Matsalolin tsutsa & tsutsa mai rage saurin gudu.
2. Karamin sarkar dabaran.
3. Babban dabaran sarkar.
4. Jikin ganga.