BB86 Bottom Bracket

Posted · Add Comment
What is a BB86/92 Bottom Bracket - Bicycle Parts Direct


Press fit bottom bracket frame shells use a simple bore with no internal threading. Shells of the PF41 standard have a smooth bore with a nominal 41mm inside diameter. This places the bearings 86mm apart – the same distance as its screw-in external bearings. But the BB86 bearings are totally enclosed within the bottom bracket shell, so there’s even more bottom bracket real estate, allowing designers to beef up the bike’s down tube and chainstays.

The BB86 bottom bracket shell is 86.5mm wide and the BB92 shell is 91.5mm wide. Both have an inside diameter of 41mm. Originally designed to use 24mm or 22/24mm diameter crank spindles, some frames can run 29mm and 30mm diameter crank spindles with direct-fit bearings. BB86/92 bottom brackets consist of bearings pressed into cups, which are then pressed into the frame. The main dimension with this standard is the inside diameter of the BB shell: 41mm.

  • Shell width: 86mm (road) or 92mm (mountain)
  • Shell inner diameter (ID): 41mm
  • Two 24×37 bearings (37mm OD, 24mm ID) or one 24×37 + one 22×37 bearing (37mm OD, 22mm
    ID) pressed into alloy cups which are pressed into frame
  • Accepts 24mm and 22/24mm cranks

We offer two types of BB86/92 bottom brackets. There is the Press Fit system and the thread together system.

Thread Together BB86/92

The thread together bottom brackets is our BB86 Out. We offer this bottom brackets in Shimano and SRAM with a variety of bearings.

Press Fit BB86/92

The Press Fit is just that the bottom bracket presses together. We offer this bottom brackets in Shimano and SRAM with a variety of bearings.

Shop Now