 The Photon SL continues Guru's tradition of incredible road performance and cutting-edge engineering. Knowing that breathtakingly low weight is nothing without stiffness, Guru fortified this high-modulus carbon masterpiece with superb power transfer and world-class efficiency. However, the carbon is also tuned in all the right places for a smooth, sublime ride with vertical compliance and vibration damping to spare. At the root of this frame's gram-for-gram supremacy is the use of North American-sourced, military-grade carbon fiber, meaning the Photon SL tips the scales at under 750 grams for a 54cm. To up the ante even further, Guru includes a featherweight ENVE carbon fork, so you can rail corners with aplomb and speed straight as an arrow in even the most hectic sprints. The specs are just as incredible. Shimano's Ultegra Di2 is a perennial favorite, and it's only gotten smoother, faster with the move to electronic. Reynolds wheels soar up the climbs thanks to the lightweight carbon rims and near-frictionless sealed bearings. Rider contact points are covered by a supportive Prologo saddle and Ritchey WCS components for excellent ergonomics and rider comfort. 

2015 Guru Photon SL (Ultegra Di2)

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