The sram bb30 pressfit 30 bottom bracket allows you to get more distance out of every pedal stroke the sram bottom bracket features gutter seal technology which ensures the dirt stays out whilst everything continues to spin smoothly a reduced weight and increased durability is made by pressing directly into your frame39s bb30 bottom bracket shell bb30 cranksets feature 30mm diameter spindles standard spindles are smaller supplies you with greater pedalling efficiency and increased power