A lightweight, comfortable aluminum endurance frame design makes for an awesome platform for long, fast group rides. The Carbon fork absorbs vibrations from the road so your arms won't fatigue as quickly. Proven Shimano 105 components are lightweight, precise and manufactured for the long haul. Disc brakes give you more precise and consistent stopping power in any conditions. Bigger tire clearance lets you run wider tires for more traction and stability on pavement, urban streets or path.