Designed for racing and for those looking to optimize each detail in pursuit of speed Wolf Tooth Aero Chainrings are strong lightweight and profiled to mate perfectly with your crankset for a clean integrated look. Taking advantage of 1x drivetrain systems and wider-range rear cassettes Aero Chainrings for Shimano Dura-Ace R9200 cranks are available in sizes to provide similar overall range to standard 2x drivetrain configurations. They feature Wolf Tooth’s patented Drop-Stop ST tooth profile optimized for the Shimano 12-speed Hyperglide+ chain for the best wear life chain retention and mud clearance.