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 molded in to the frame for the bearings to seat against.
BB90 bottom bracket
Important Notes
- Trek BB90/95 frames do not use bearing retainer clips.
- Wheel manufacturers do not make a cup & bearing system for BB90/95 frames. Your only option is to replace your existing bearings when necessary.
Compatibility
- Compatible with 24mm or 24/22mm spindle cranks only.
