Racing against the clock. Every detail is critical. Nothing is left to chance. Lightness and aerodynamics are the keywords. CampagnoloR dedicates various special components to time trials: bar end controls, chainrings with oversized toothing and super light brake levers in composite material. Ultra Shift chainrings synchronization for improved shifting precision and quickness Ultra Shift asymmetric teeth profile on inner chainrings for shifting and chain crossing optimization. Improved Ultra Shift hard anodizing treatment. Fits 11 speed Super Record, Record, and Chorus. 5 tooth ring for 34 tooth.