Robert Axle Project just announced a U.D.H. ($32), machined for an exact fit from 6061 aluminum. Modern drivetrains are precise and exacting and deserve to be mounted to a derailleur hanger of equally precise quality. The Robert Axle Project Universal Derailleur Hanger is made to the exact same geometry as the stock SRAM hanger ensuring a perfect fit to your bike and any drivetrain you’d like to mount to it.