General description SRAM X-SYNC Direct Mount Chain Ring is designed for optimal chain control and performance. Featuring SRAM's innovative wide-tooth narrow-tooth technology, this chainring ensures maximum efficiency and durability. The laser-etched finish enhances its longevity, while the X-Range gearing technology provides a broader range and smoother gear transitions, making it ideal for various cycling conditions, including time trials and triathlons. Technical specifications Chainring Size: 42T Available Sizes: 38T, 40T, 42T, 44T, 46T, 48T, 50T Bolt Circle Diameter (BCD): Direct Mount (DM) Speeds: 12 Material: Aluminum Color: Black