The truvativ gxp pressfit bottom bracket a variant of the external bottom bracket pressfit cut weight by up to 40 grams and provide easier installation by allowing you to press the bearing cups into the frame instead of threading them there39s no change to the crank spindle length and diameter remain the same as standard gxp xx xo x9 compatible with sramtruvativ gxp cranksets truvativ gxp pressfit bottom bracket features compatible with sramtruvativ gxp cranks lightw