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DUB ceramic bottom brackets give riders an additional option for even more silky-smooth performance. This is a whole other level in bottom bracket friction reduction, thanks to its high efficiency, ceramic bearings. What’s more, the DUB ceramic bottom bracket can help riders save precious rotational energy without sacrificing the kind of robust seals required for real MTB and road racing scenarios. High efficiency ceramic bearings save riders rotational energy Silky smooth, without sacrificing robust seals required for real life durability MTB and racing scenarios One oversized spindle to work across every bottom bracket standard Significantly lighter than PFGXP system PressFit (MTB: 89/92mm) Spindle Interface Type: SRAM DUB Bottom Bracket Shell I.D.: 41 BB Shell Width: 89.5mm, 92mm BB/Frame Interface: BB89.5, BB92 Weight: 110g. Color: Black