The new 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 weve engineered the dub™ spindle to be the one true unifying component. One oversized spindle to work across every bottom bracket standard. For better crankarm compatibility. For better protection from the elements. For longer-lasting performance. To be stronger smoother simpler. Now back to the ride. - bb-frame interface: bb386 pf30 (68-73mm) pf30 (73mm) pf30 (79-83mmorbbright) pf30 (83mm) - crank-bb interface: dub - bearing type: standard - spindle diameter: dub - spindle length: n/a - chainline: n/a - support e-type fd: n/a - cup material: aluminum