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 the derailleurs match the chain. They offer more options, levels and finishes than their competitors. They use the best materials available, imported from the USA, Europe or qualified suppliers in Asia, to ensure that durability, performance and appearance outperform and outlast the competition. Full Speed Ahead drivetrains have powered several World Champions, Tour de France and Olympic champions and will exceed your expectations. BCD: direct mount Drive - 12s Type Chainrings Technology DirectMount Series SL-K Discipline MTB Bolt Circle Diameter (BCD) Direct Mount Crankset Type Single