SRAM X-Sync wide-tooth, narrow-tooth chainring technology provides maximum chain control 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 youÌÎÌ__ÌÎÌ__re always in the right gear Can be installed with a single tool, making gearing changes a breeze