As far as hillclimbing machines go, this quad bike has to be a frontrunner. As you can see, it's a quad bike that has been significantly customized to compete in hillclimbs all across New Zealand. A Suzuki LT500R from the 1990s served as the basis for this quad, according to Hillclimb Monsters' YouTube channel.
An inline 4 from a Suzuki GSX-R1000 superbike with 140-hp and special suspension has been installed. The quad bike was designed by Ian Ffitch and is presently driven by him.
A rocket ship on wheels, it weighs barely 485 lbs. The max speed is a reported 142 mph. That's the same speed limit as the last-generation Fiesta ST.
The aerodynamics may be the most interesting element. Both the front and back wings deploy when Ffitch presses the brakes, with the front serving as an air brake. See it in practice by keeping your eyes focused. It's unreal for a quad bike. It must be a lot of fun to ride this thing!