Series of four-hole chainrings with High Stiffness Points (HSP), compatible with the Shimano ® Ultegra FC-8100 12V crank set. Manufactured from CNC-machined AL 7075 T6 aluminium alloy. Black finish with total anodizing surface treatment (TT). With five teeth options available for internal chainrings and seven for external chainrings, it is always possible to find the right configuration for you. Aluminium chainring bolts included.