I didn’t realize how real the Tumbler was:

How Stuff Works tells us the film’s makers “manufactured four complete, street-ready race cars,” which use an actual 5.7-liter Chevy V-8 engine. “This engine has been tuned so that it can provide the power necessary to take a 5,000-pound vehicle from zero to 60 mph in 5 seconds.” Those enormous tires are real. “The rear tires are 37-inch-diameter, off-the-shelf, 4×4 mud tires called Super Swampers made by Interco,” while the front features a set of Hoosier racing tires. The rear uses a standard truck axle, but the front wheels are not mounted on an axle at all. Each is instead mounted on “independent suspension elements inspired by the long-travel suspensions of Baja racing trucks. When airborne, the front wheels pop out about 30 inches on their suspensions to absorb the shock of a 30-foot fall.”

via Subtraction