argon 18 sum pro crystal black ultegra di2

All Together FasterMeet the best of the best: aero to match the Nitrogen, pure road performance to match the Gallium Pro, with race-ready handling and premium ride quality. The all-new Sum Pro features our most advanced layup and technologies to get you to the front of the group and keep you there, through the climbs, the corners, and the sprints.Shimano Ultegra Di2 R8150With lightning-fast, accurate, and reliable shifting performance, Ultegra Di2 puts riders in complete control and ensures a seamless interface between the cyclist and bike.Repente Prime 3.0The saddle shape, modeled on anatomical and ergonomic data, provides necessary support at strategic points, for comfortable and effective pedaling. Every single detail of Prime 3.0, including its low weight of 160g, has been designed to raise your level of performance on the SUM Pro.Zipp 303 SZipp’s 303 S wheelset features ideal-for-every-terrain 45mm rim depth with increased internal width to provide greater performance and ride quality in almost every measurable way.