The smoother, faster Specialized Roubaix Expert SL4 Disc 2013 Road Bike features a super light and stiff FACT 10r carbon frame with tapered head tube, Zertz vibration dampers, and full internal cable routing. Equipped with Shimano Ultegra components, DT Axis 4.0 disc wheels and Shimano mechanical disc brakes. Specialized FACT IS 10r carbon SL4 frame with Zertz is the fastest and smoothest endurance bike available, with size specific engineering, tapered headtube, ultra lightweight. All-new Specialized FACT carbon fork with Zertz has size-specific engineering that creates a more balanced and stable ride for riders of different sizes. Specialized Roubaix Pro 120 TPI tire has 23mm tread handles quick and fast while the 25c casing smooths our ride and keeps you fresh longer. Adjustable four-position oversized alloy stem with 31.8mm bar clamp for strength and versatile positioning. Specialized Expert shallow drop alloy bar for serious performance; wrapped with non-slip Specialized Roubaix tape for vibration-damping. Minimalist, high-performance BG Toupe RBX Sport saddle with hollow Cr-Mo rails, flat profile and generous padding; partnered with FACT carbon Comp seatpost helps absorb road vibrations.