Our light, stiff, and durable direct mount chainrings let you pick the exact gearing you want and quickly swap sizes. Our X-SYNC technology keeps the chain where you need it to be, too.Features:- X-SYNC wide-tooth, narrow-tooth chainring technology provides maximum chain control- Laser-etched chainring finish is more durable- X-Range gearing technology gives you more range and a smoother gear progression, so you're always in the right gear- Improved aerodynamics for time trial and triathlonSpecifications:- Chainring Size: 38T- Bolt Circle Diameter (BCD): Direct Mount (DM)- Speeds: 12- Material (Chainring): Aluminum