The Shimano BB91 Press Fit Bottom Bracket Mountain42A fits mountain frames with a bottom bracket shell width of 845mm with a 42mm internal diameter Use only Shimano Hollow Tech II cranksets with this bottom bracket Key Features Actual weight 65 grams Fits Shimano Hollow Tech cranksets For BB shell widths of 845mm PressFit BB shells only no internal threads 42mm BB cup diameter

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