Oval chainrings compatible with the new ALDHU 3D+ cranks, ROTOR\'s lightest crankset ever, but also compatible with 4-bolt Shimano cranks. When mounted to ROTOR\'s ALDHU 3D+ cranks, these Q-Rings can be adjusted in 1-degree increments. When mounted to Shimano cranks, the chainrings are set to intermediate position OCP #3, which is the position most frequently used by road riders. For a perfect aesthetic integration with Shimano cranks, there is a set of bolt covers for the different crank models. Specifications:Color: Black AnodizedNumber Of Teeth: 34, 36, 39, 50, 52, 53Bcd: 110x4Technologies: Alu7075, CNCQring Type: Inner, OuterCompatibility: NoDiscipline: Road