The most extreme stunts on MTVs Guy Block. See you Sunday Feb 8th<br /><br /><br /><img src="http://ll.broadbandsports.com/images/23669_motorsports_NC_viral_bigwheelbackflip.mov.jpg" alt="Nitro Circus Big Wheel Back Flip" title="Nitro Circus Big Wheel Back Flip" width="150" height="90" alt="Nitro Circus Big Wheel Back Flip"/>
