Rent Rats: Night of Terror (1984)

One hundred years after a nuclear war has devastated the planet, society has been reborn into two factions; the underground society and the scavengers above in the wastelands. A group of scavengers on bikes come across a town infested with flesh eating rats, and soon the gore is spilling everywhere! Ferocious in their demonic intent they devour human flesh and all that they can get their teeth into...