- 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 SRAM 8-Bolt cranks replace your existing spider and chainring with one clean looking, lightweight, and stiff piece of machined billet, optimized for SRAM 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 aluminum