So light it defies superlatives, Guru's fully customizable Photon turns once-formidable climbs into your personal stomping grounds. Knowing that weight is nothing without stiffness, Guru fortified this high-modulus masterpiece with superb power transfer and world-class efficiency, while also tuning the carbon in all the right places for a smooth, sublime ride. At the root of this frame's gram-for-gram supremacy is the use of North-American sourced, military-grade HS-40 carbon fiber, making it tip the scales at under 750 grams for a 54cm, one of the lightest custom frames in the world. Its gorgeous, flowing lines make it easy on the eyes, too. Plus, Enve's featherweight carbon fork rails corners with aplomb and guides you straight as an arrow in even the most hectic sprints.