Less-brutal classes are limited to a 66-inch wheelbase, but there aren't many rules for an Open Exhibition Class hillclimber such as Jon Smith's Suzuki Hayabusa-powered atrocity. Wheelbase? Whatever works. No steel appendages allowed on the rear tire. Nitrous-oxide injection is permitted, but nitro methane is specifically verboten in the Western States Professional Hill Climb Series, though other sanctioning organizations aren't quite so picky.The 'Busa-based 'climber was the only motorcycle to touch the summit of this year's Widowmaker Hillclimb in Croydon, Utah, 45 miles from Smith's home in Woods Cross. His Suzuki covered the 1000-foot, 72-percent face in 41.2 seconds. That, sports fans, is quick.