Sram DUB Threaded Bottom Bracket Urban & Travel concave platform to give additional Kitchen Sink concave platform to give additional grip to the 8 replaceable hex traction pins per side Tough nylon composite platform with improved grip contact points molded into body along axle line 8 bottom loading hex traction pins per side Better tolerance fit for pedal pin nuts in body to eliminate any risk of stripping when removing old pins Fully sealed • Hidden Air Vents in the Body – help prevent air locking in challenging plumbing installations and help with check valve operation Spindle Interface Type: SRAM DUB SRAM engineered the oversized DUB spindle to work across every bottom bracket standard