Premium Shimano 110/4 bcd compatible oval chainrings are designed for Dura-Ace 9100 and Ultegra 8000 but can also be retrofitted to 9000 and 6800 series cranks. Expertly CNC machined from 7075 aluminum and type II anodized for a long lasting contruction and finish. Ramps on big rings are specially configured for combinations: 50/34 52/36 52/38 53/39T – other combinations will work but may require more derailleur adjustment. *30T can only work with 46T and special bolt set 46/30. (bolts included with small ring). *32T can only work with 48T and special bolt set 48/32. (bolts included with small ring). Due to special mounting construction aesthetic bolt covers are not offered for these designs

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