In Dead Rising 2 for the PS3, Xbox 360, and PC, you can combine a couple weapons with the dirt bike to make some fairly powerful vehicle weapons.
You must first obtain the motorcycle trailer by defeating the psychopath Leon in the “Here Come The Contestants” mission to do these combos.
Giant Stuffed Rabbit Motorcycle – Dirt Bike + Giant Stuffed Rabbit
Machine Gun Motorcycle – Dirt Bike + Light Machine Gun
Rocket Launcher Motorcycle – Dirt Bike+ Rocket Launcher
Slice-Cycle – Dirt Bike + Chainsaw
Wheelchair Motorcycle – Dirt Bike + Wheelchair