Motorcycles just don't get much more custom than this one-off streetfighter, built in 2007 by Gregg DesJardins, owner of GC Customs. He started with the good-looking air-cooled 1670cc V-twin from a Yamaha Road Star Warrior, then made just about everything else with his own hands.

Wrapping itself around the motor is a 4130 chrome-moly frame with strategically sheeted-in sections. It is left bare and clearcoated to show off the welding craftsmanship involved. Signature piece is the single-sided trellis-style swingarm with lightening holes bored through. It holds a massive 8.5 x 18-inch GC rear wheel, its actions controlled by a side-mounted Penske shock running a titanium spring. More Ti is evident in the footpeg mounts and the brackets holding the headlight to the fork's triple-clamps.

Trickness abounds in the bike's braking system. Wanting to keep the rear wheel as free from clutter as possible, DesJardins worked out a midships-mounted rotor and caliper setup that works directly on the countershaft sprocket. Up front, sportbike-spec radial-mount PM calipers bolt to the bottom of a 50mm Marzocchi inverted fork, but the brakes' master cylinder reservoir – usually an unsightly plastic bottle – is nowhere to be seen. That's because DesJardins cleverly incorporated the reservoir into the handlebars, accessible via a small capped nub atop the bars. A matching arrangement activates the bike's hydraulic clutch.

Featured in many magazine and websites, named Best Pro Built Yamaha during the 2008 U.S. Grand Prix at Laguna Seca, the GC Hellion is California titled and licensed.