Buell's founder, Erik Buell, has always provided innovative design solutions in his bikes, and the Firebolt is no exception. Like all Buells, the Firebolt uses a Harley-Davidson engine (Buell is owned by Harley) in a short, sportsbike chassis.

But hidden inside this chassis are a few surprises. The hollow aluminium twin-spar frame doubles as the fuel tank, while the rear swingarm is also hollow, holding the oil tank for the dry-sump engine. These unique designs save space and weight, allowing the Firebolt a featherweight 175kg (3861b) claimed dry weight, as well as an ultra-short 1320mm (52in) wheelbase. The space created above the engine by the unconventional fuel tank allows a large-volume airbox, further boosting power and torque.

The rim-mounted front brake is also a first on a production bike, and is designed to give stronger power and better cooling. The power from the six-piston caliper biting on the huge 375mm (15in) disc means only one disc and caliper is needed, further saving unsprung weight. This also helps the fully-adjustable Showa suspension give a well-damped, compliant action, as well as improving acceleration. It also means braking forces are not transmitted through the wheel's spokes, allowing a lighter wheel design.

The Harley-based engine is a 45° V-twin with a curious mix of technology. Even though it uses air-cooling and pushrod overhead valve actuation - both now outdated technologies - it has an advanced, modern fuel-injection system to improve power and drivability while meeting tough emissions laws. Air ducting, large cooling fins and a fan keep the rear cylinder cool despite being hidden behind the frame, and the large-capacity silencer, essential to reduce noise emissions, is hidden away underneath the engine behond a stylish bellypan.