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Usage: Road Ring material: carbon brakes › See more product details; Product description The Shimano Dura-Ace R9100 C40 rear wheel allows faster acceleration with OPTBAL spoke system for greater driving safety. The laminated carbon rim provides lightness and rigidity. FREEHUB Lightweight Titanium Body The best multi-purpose kit offers a balance between low swing power and aerodynamic design.; Product description The Shimano Dura-Ace R9100 C40 rear wheel allows faster acceleration with OPTBAL spoke system for greater driving safety. The laminated carbon rim provides lightness and rigidity. FREEHUB Lightweight Titanium Body The best multi-purpose kit offers a balance between low swing power and aerodynamic design.; The Shimano Dura-Ace R9100 C40 rear wheel allows faster acceleration with OPTBAL spoke system for greater driving safety. The laminated carbon rim provides lightness and rigidity. FREEHUB Lightweight Titanium Body The best multi-purpose kit offers a balance between low swing power and aerodynamic design.