BB90 vs. T I won’t miss BB90, the worst bottom bracket standard - BikeRadar - Bb90 bottom bracket
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The BB90/95 standard is currently used by Trek. Two sealed bearings are pressed directly into the frame's bottom bracket shell. A step is molded in to the frame. The BB90/95 standard is used by Trek on many frames. Two sealed bearings (37mm OD) are pressed directly in to the frame's bottom bracket shell. A step is.