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The shimano dura-ace di2 r9150 front derailleur adapter for 34.9 mm clamp has an elaborate system called system supremacy. Each component improves the qualities of the others to guarantee excellent results. Advantages of system supremacy:new hub arm design for optimal power transferprecise and simple front derailleur set with lighter and more intuitive shift operation shimano shadow rd construction for stable shifting resultsperfectly balanced hydraulic braking system for racing with better heat dissipationice technologies freeza