SRAM

 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 107mm 4-bolt 55T Grey 12sp Standard

 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 107mm 4-bolt 44T Black 12sp Standard