The SRAM DUB bottom bracket series has a simple job—connect your crankarms and protect the smooth, long-lasting application of power to your drivetrain. To allow that singular focus, SRAM has engineered the DUB™ spindle to be the one true unifying component. One oversized spindle to work across every bottom bracket specification. For better crankarm compatibility. For better protection from the elements. For longer-lasting performance. To be stronger, smoother, and simpler. One oversized spindle to work across every bottom bracket specification Gutter Seal Technology seals against the elements Significantly lighter than GXP system Sealed cartridge bearings available in both stainless and ceramic versions Details: Model: BB-DUB-BSA-A1 Spindle Interface Type: SRAM DUB BB/Frame Interface: English/BSA Bottom Bracket Shell I.D.: 1.37 Bearings: Ceramic or Stainless Steel Weight (68/73mm): 130 grams (Ceramic) Compatibility: The SRAM DUB English/BSA bottom bracket is compatible with the following: Crankset: SRAM DUB cranksets Frame Interfaces: 68mm (Road Wide) 68/73mm (MTB) 68/73mm (MTB Wide, 55mm chainline) 73mm (E-Type SuperBoost+) 73mm (SuperBoost+) 73mm Cannondale Ai (MTB) 83mm (MTB) 83mm Cannondale Ai (MTB) 100mm (MTB)