Shimano Dura-Ace R9150 31.8mm Front Derailleur Adapter

The Adapter Shimano Dura-Ace Di2 R9150 for clamp 31.8 mm has a system engineering called System Supremacy. Each of the components magnifies the qualities of others to achieve unparalleled performance. Advantages of System Supremacy: - New design of connecting rod arm for optimal power transfer - Precise and simple derailleur set with lighter and more intuitive shift operation - Shimano Shadow RD construction for stable change performance - Optimally balanced hydraulic braking system to compete with better heat dissipation - Ice Technologies Freeza