Taking advantage of 1x drivetrain systems and wider-range rear cassettes, Aero chainrings provide similar overall range to standard 2x drivetrain configurations while helping to optimize each detail in pursuit of speed. Aero direct mount chainrings for 8-Bolt cranks replace your existing spider and chainring with one clean looking, lightweight, and stiff piece of machined billet, optimized for Eagle and Flattop chains. Chainline is 45mm on standard spindle cranks and 47.5mm on wide spindle cranks for 46-52T chainrings. Made in the USA with 7075-T6 aluminumItem Specifications: Oval/Round, Round, Teeth, 46, Color, Black, Model Name, Aero, Drop-Stop B, Ring Type, Single (Anti-Chain Drop), Mount, 8-Bolt DM,.