Shimano DURA-ACE FC-R9100 52D Chainring The 11-speed chainring with a 110mm BCD and 4 asymmetric bolts for a wide variety of 2-speed combinations. It has an aero and hollow profile (Hollowglide) for greater rigidity and less weight. Valid to mount only in combination with 36D chainring. It is also compatible with the Dura Ace power meter.
