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



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