The Cannondale SuperX Ultegra Compact 2012 Road bike weighing in at 1400 grams for frame and fork, it's the lightest, stiffest, smoothest 'cross frameset on the planet.
Type
Road
Frame
Superx, Ballistec Carbon, Speed Save, Bb30
Frame material
Carbon Fibre
Fork
Superx, Ballistec Carbon, 1-1/8" To 1-1/4" Steerer