Sporting an uber-cool look, the 450 SX-F is built on a high-level chassis and a central double-cradle-type frame that sets it apart from others in its class. Getting this KTM dirt bike to the finishing line first is its single-cylinder, four-stroke, 449.3 cc engine, and setting you up for success right from the go is its ultra-light electric starter. Also new for the 2010 model is its five-speed gearbox and CNC-machined triple clamps