Indoor forklifts come with cushion or polyurethane tires to make it easier to maneuver on smooth warehouse floors. Outdoor forklifts use pneumatic tires with deep treads and more ground clearance to make them easier to drive on rough terrains. Generally, the forklift's wheels and frame are designed for a specific tire type, so check the forklift's manual before going with a different tire type than what is recommended. It is rare for the forklift to have the ability to switch from a cushion tire to a pneumatic tire.