Wolf Tooth Components Drop-Stop Elliptical Chainring: 30T for SRAM GXP Direct The simplest way to explain the way these rings feel is having 2 teeth less in the weak part of your pedal stroke and 2 teeth more where you have the most power Made from 7075 Aluminum for long life Compatible with S2200, S2210, X9,XO,XO1,XX1,X1 1400 Cranks 50mm Chainline for optimal rear shifting Can also be used on long spindled BB30/PF30 cranksets