The SRAM DUB bottom bracket series has a simple job— to connect crankarms and protect the smooth, long-lasting application of power to the drivetrain. SRAM engineered the oversized DUB spindle to work across every bottom bracket standard, simplifying crankarm compatibility. This bottom bracket is intended to be used with DUB Wide cranks with a 55mm chainline. This setup is compatible with some SuperBoost 12x157mm rear hub bikes, but also compatible with newer Boost 12x148mm bikes to allow the use of larger than spec chainrings or to fine tune your chainline.