System supremacy
Shimanos Dura-Ace 11-speed asymmetric chainrings provide clean chain engagement for reliable riding. The 110 BCD bolt pattern is compatible only with cranks with a matching 110 BCD.

• System engineering at its peak.
• Redesigned gear teeth profile to fit wider gear pitch
• Optimum power transfer
• Best balance for lighter weight and efficiency
• 4-arm construction
• Shorter length of rear center with O.L.D.135mm
• Hollowtech II