Shifting has helped Full Speed Ahead become a world leader in high-end gearboxes. No one examines the design and manufacture of every system and every tooth as carefully as we do. Our determination shows in every turn of the crank and every perfect shift achieved. To meet or exceed the needs of any drivetrain, Full Speed Ahead has developed sophisticated design, testing and manufacturing protocols. This allows Full Speed Ahead to match your needs as perfectly as our derailleurs match the chain. We offer more options, levels and finishes than our competitors. We use the finest materials available, imported from the USA, Europe or our qualified suppliers in Asia, to ensure that durability, performance and appearance outlast and outlast the competition. Full Speed Ahead drivetrains have powered several World Champions, Tour de France and Olympic champions and will exceed your expectations. Precision CNC Machined AL7075/T6 Direct Mount Outer Chainring Black Anodized Laser Etched Logo Compatible with Modular Crankset (Gossamer/Energy/SL-K) Type Chainrings Technology DirectMount, Modular Color Neutral Discipline ROAD, GRAVEL Material Alloy Compatibility ENERGY Modular, SL-K modular Bolt Circle Diameter (BCD) DIRECT MOUNT, 90 Crankset Type Double Drivetrain Compatibility Shimano 10/11S, Sram 10/11S, FSA 11S