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SRAM Bottom Bracket DUB | BB30 73 MTB-Wide (55m Chainline) Socks and live comparisonsThe right bottom bracket for SRAM DUB MTB Wide cranks for mountain bike frames with BB30 bottom bracket shell. The DUB bearings have an improved seal to ensure that the crank runs as smooth as silk for longer. Technical Specifications Intended use : MTB Material bearing shell: aluminum Material bearing: steel Bottom bracket type: BB30 Inner bearing shell width: 73 mm Inner bearing housing : 42 mm Compatibility crank: SRAM DUB MTB Wide cranks