ROTOR Round RIngs BCD110x4 . Round BCD110x4 chainrings compatible with all ROTOR cranks using BCD110x4 spider or INspider power meter. In addition, these chainrings are also compatible with Shimano® Dura-Ace® FC-9100 and Ultegra® FC-8000 cranks offering fast and precise shifting, while keeping weight very low. ROTOR round chainrings come to complete the chainring range for those cyclists who have not yet decided to try Q RINGS oval chainrings. When you are looking for speed, functionality and lightness, the components of your bike have to reflect these needs. *Cranks arms, axle, chainring bolts, spider & power meter not included.