Izingxenye ZamaWheeli Eziphakathi: Ukukhetha Okufaneleka Kwezidingo Zakho Isingeniso - Ukuqonda Izingxenye ZamaWheeli Eziphakathi Nokubaluleka Kwazo Izingxenye zama wheeli eziphakathi, ezivame ukubizwa ngokuthi ama-pulleys noma ama-rollers, ziyizinto ezibalulekile ezivumela ukuhamba kahle nokusebenza kahle kweziminyango eziphakathi.