Trek BB90/95 Technical Info - Wheels Mfg

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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 for the bearings to seat against. Trek BB90/95 frames do not have bearing retianer clips. Compatible with 24mm or 24/22mm spindle cranks only.

Shell width: 90.5mm (road) or 95.5mm (mountain)
Shell ID: 37mm
Uses two sealed bearings (37mm OD) which are pressed into the frame and stop against a raised step built into the frame's bottom bracket shell.
No snap rings are used.