Trek BB90/95 Technical Info

The BB90/95 standard is currently used by Trek. Two sealed bearings 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. 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 in to the frame's bottom bracket shell. No snap rings are used.
  • Use with 24mm or 24/22mm spindle cranks originally intended for use with external cup bottom brackets (Shimano HollowTech II, SRAM GXP)

BB90/95 Exploded View