FSA Pro Road Chainrings deliver flawless shifting for any road drive train. Precision CNC machined AL7075/T6 alloy N-10 chainrings are compatible with , SRAM and Campagnolo Ultra Narrow 10-Speed drive trains S9/C10 chainrings are compatible with 9 speed and Campagnolo C10 10-Speed N-11 chainrings are compatible with all 10 speed drivetrains, and compatible with FSA, SRAM and 11 speed drivetrains FSA Pro Road Chainrings deliver flawless shifting for any road drive train.Precision CNC machined AL7075/T6 alloyN-10 chainrings are compatible with , and Campagnolo Ultra Narrow 10-Speed drivetrainsItem SpecificationsTooth Count39Ring Position/TypeMiddleDrivetrain Speeds10Chainring BCD130ColorBlackDefined ColorBlackMaterialAluminumkeyword searchWB090-39T