Einstein created the theory of relativity while riding a bicycle; had he been aboard the 2015 Quintana Roo PRsix Ultegra Di2 Race, he'd have witnessed time slowing as he approached the speed of light. Fully embracing the ultimate in speed, this full-carbon rig blends extensive wind tunnel testing with real-world riding applications to give you a wind-cheating TT machine that's also one of the lightest frames in its class.