Size 55 (175cm to 180cm) The addition XR4 and 'a bike super aerodynamic, rigid-frame constructed with the use of canceling Countervail Vibration System to maximize your aerodynamic advantage. The most complete and extreme bike racing ever created. Suitable for road, plain and downhill stretches, hilly and fast tracks. Designed for those who love the thrill of speed 'and dell'areodinamica taste. Ideal for professional use and for those who like to ride the attack and wants to maintain an aerodynamic position for a long time.