All told, each wheel and tire weighs 645 pounds. The BKT tires are wrapped around 25-inch beadlock wheels, and are inflated to just 23 psi.

sort of, after she won the high-jump competition at Monster Jam World Finals.Īs for the trucks' massive tires, each one is 66 inches tall with 43-inch-wide tread. A transmission pick-up with a valve at either end of the case ensures that fluid is running no matter what position the truck is in.ĭriver Cynthia Gauthier and her crew chief are all smiles, well. Monster Jam mechanics have worked out a way to ensure those transmission work even while the truck is in a vertical wheelie stand, where the driver might shift from reverse to first gear and back in quick succession. A high final drive ratio is better for initial acceleration. That's fine - remember, these trucks are all about short bursts of power. That means the trucks have tons of torque available at all four wheels, but don't have a high top speed. The engines send power to all four wheels through a two-speed transmission with a mind-blowing 22:1 final drive ratio. That might not seem like a long time, but remember, these motors are constantly subjected to insane forces of gravity, and have to perform flawlessly while sideways, upside down and everywhere in between. The giant monster hearts are built to last for 32 hours of hard driving.

Most truck use 572-cubic-inch engines, but Gravedigger runs a slightly smaller, 540-cubic-inch unit. Monster trucks can produce as much as 1,500 horsepower and 1,320 pound-feet of torque from their supercharged, big-block engines.

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