SRAM X-Sync wide-tooth, narrow-tooth chainring technology provides maximum chain controlLaser-etched chainring finish is more durableX-Range gearing technology gives you more range and a smoother gear progression, so youre always in the right gearCan be installed with a single tool, making gearing changes a breeze107mm 4-bolt42TGrey12spStandardUPC/EAN/GTIN: 710845825620