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- 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 - improved aerodynamics for time trial and triathlon - chainring size: 36t 38t 40t 42t 44t 46t 48t 50t 46-33t 48-35t 50-37t - bolt circle diameter (bcd): 107mm or direct mount (dm) - speeds: 12 - compat - yaw: n/a - material (chainring): aluminum - color (chainring): black