This ring can be used to convert a 2x12 SRAM Force chainset to a single ring. The ring is 107 BCD. As of April 2021 this is the only option to do so - no other brands than SRAM are currently making it. FEATURES SRAM 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 Can be installed with a single tool, making gearing changes a breeze SPECIFICATIONS Chainring Size: 36, 38, 40, 42, 44, 46 Bolt Circle Diameter (BCD): 107 BCD Speeds: 12 Compat - Yaw: n/a Material (Chainring): Aluminum Color (Chainring): Black, Grey