SRAM FORCE 1X D2 175x40 DM DUB NoBB IR-BKSingle ring drivetrain, with X Sync chainring simplifies functionality and reduces weight Sram X Sync narrow wide chainring technology provides maximum chain control Direct mount chainrings are lighter and stiffer than traditional spider based rings Updated black and iridescent grey colorway and graphics DUB bottom bracket adds durability and simplicity Can be upgraded to a power meter