Thanks to its velvety-smooth, incredibly efficient carbon frame and fork, Specialized's Roubaix SL4 Expert makes every ride better. The Roubaix also boasts super-speedy DT Swiss wheels and a Shimano 20-speed Ultegra component group with a compact crankset that provides premium shifting and the low gears to summit any hill in record time. Plus, you can't beat the Specialized carbon seatpost, Body Geometry seat and ergonomic handlebars for even more high-speed comfort.