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High-end narrow/wide chainrings designed for 1 x 9/10/11/12-speed transmissions that use a direct-mount SRAM X-Sync crankset with a 148mm Boost chain line3 mm offset optimized for a 148 mm Boost chain line.Available in round or oval configurationsOvality: 12%-13%, timing of 115° after PMH (top breakeven)Anodized color finish with laser-etched graphics