Single-ring drivetrain simplifies functionality and reduces weight 48 and 50t variants feature direct mount aero chainrings for better aerodynamics Sram X-sync wide-tooth, narrow-tooth chainring technology provides maximum chain control Laser-etched chainring finish is more durable DUB bottom bracket adds durability and simplicity Can be upgraded to a power meter 172.5x48 Aero DUB Silver/Grey Direct Mount 1x12UPC/EAN/GTIN: 710845823701