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2007 Buell Firebolt XB12R Road Test

8-1-2007

by Mark Hacking , Auto123.com

This agility is not only due to centralized mass, but also to the Firebolt's frame construction and configuration; a rigid and lightweight aluminum chassis, relatively short wheelbase (52 inches) and steep rake (21 degrees) give the Buell an aggressive stance and set the stage for aggressive performance.

The Firebolt also didn't feel as heavy as the spec sheets would suggest. With a dry weight of 395 pounds, it's on the somewhat portly end of the big sportbike scale. But tipping the bike into corners, both quick and slow, was an effortless task.

The 1203cc V-twin has a very distinctive sound.

Urban Jungle Explorer

The suspension system on the bike, courtesy of rebounding experts Showa, is a well-sorted and trick bit of work. Out front is a fully adjustable 43 mm upside-down fork, while a fully adjustable rear shock sits out back. The system is effective at absorbing imperfections and keeping the Buell stuck to the tarmac; new Pirelli Diablo T tires complete the grip picture.

The engine also helps with big-city handling. It's an extremely flexible powerplant with a wide torque band - so much so that you could conceivably stay within the city limits and stay in first gear for most of the time. Peak horsepower and torque are achieved at the 6,800-rpm redline, but there's ample power down low as well.

The engine incorporates an InterActive Exhaust system - the ECM controls a valve in the muffler to adjust exhaust flow according to riding conditions, thereby smoothing out the torque delivery. But even though the V-twin doesn't need to be revved out like a 4-cylinder, it still seemed to prefer being wound out at least a little bit. A couple of times, the engine sputtered somewhat ominously, but this was likely due to my too relaxed approach to throttle usage.

A Mighty Braking System
At the other end of sportbike requirements, the brakes on the Buell are an interesting proposition. In the interests of reducing unsprung weight and increasing performance, the manufacturer has opted for a zero torsional load (ZTL) front braking system.

The front brake is powerful and might need a little time to adjust to it.
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