The 2015 Specialized Roubaix SL4 is an endurance road bike engineered for comfort and performance over long distances. Its SL4 FACT carbon frame incorporates Zertz vibration-damping inserts, effectively reducing road vibrations and enhancing ride smoothness. The bike is available in various models, including the Roubaix SL4, which features a FACT carbon 8r frame and a Shimano 105 groupset. Both models are designed with internal cable routing for a clean aesthetic. The geometry of the Roubaix SL4 offers a balance between responsiveness and comfort, making it suitable for riders seeking a smooth ride on diverse road surfaces.