Step 1 – What is the Frame’s BB Shell?

To accurately identify the BB shell in your frame, it is important that you remove the cranks and bottom bracket from the frame and measure. Don’t guess! Don’t rely on frame descriptions or stickers on a frame. A few manufacturers (Cannondale, Cervelo) are using asymetrical BB shells which may require a very specific bottom bracket. Our Bottom Bracket Standards page will help you identify what Bottom Bracket shell your frame has from your measurements.

Measure the bottom bracket shell on your frame:

BB Shell Width

Outside to outside of frame with Bottom Bracket cups removed.

BB Shell Inside Diameter

With Bottom Bracket cups or direct-fit bearings removed.

Threaded or Press Fit?

Threaded BB Shell

Frame will have threads where the cups insert.

Press Fit BB Shell

Frame will be smooth (no threads).

Step 2 – What is the Crankset Spindle?

Wheels Manufacturing currently offers bottom brackets compatible with the following spindle configurations: 30mm diameter, 29mm SRAM DUB Compatible, 24.00mm (Shimano, etc.), 22mm/24mm SRAM GXP. See our Crankset Page for help identifying your crankset.

Crank spindle diameter: The photos below show the different spindle diameters the Wheels Mfg currently offers bottom brackets for. Use a quality set of calipers of micrometer when measuring the spindle diameter. You will want to measure exactly where the bearings will be positioned on the spindle.

24mm Spindle (Shimano, etc.)

22mm/24mm Spindle (SRAM / Truvativ GXP)

29mm Spindle Cranks (SRAM DUB)

30mm Spindle Cranks

Effective Crank spindle length:

With both crank arms attached to the spindle, measure the distance across the spindle between the crank arms. This is the space that your BB shell plus bottom bracket has to fit into. Our list of frame + BB widths can be found HERE.

Step 3 – Select Your Bottom Bracket!

Now that you have all the necessary dimensions, you can select your bottom bracket. Please look at the diagrams below to identify by the frame standard they fit (PF30, 386EVO, etc.). From there, you will choose one that is compatible with your cranksets. If you are still uncertain, we recommend you have your local bike shop help you with selecting and installing the correct bottom bracket.


BSA Threaded Standard


  • Shell width: 68mm (road) or 73mm (mountain)
  • Drive side = Left Hand threads
  • Accepts 24mm and 22/24mm cranks
  • Accepts 30mm spindle cranks

BB30 Standard

  • Shell width: 68mm (road) or 73mm (mountain)
  • Shell inner diameter (ID): 42mm
  • Two 6806 bearings (42mm OD, 30mm ID) pressed directly in frame and stop at removable snap rings
  • Accepts 30mm spindle cranks
  • Accepts 24mm and 22/24mm cranks

PF30 Standard


  • Shell width: 68mm (road) or 73mm (mountain)
  • Shell inner diameter (ID): 46mm
  • Two 6806 bearings (42mm OD, 30mm ID) pressed directly in frame and stop at removable snap rings
  • Accepts 30mm spindle cranks
  • Accepts 24mm and 22/24mm cranks

BB86/92 Bottom Brackets

  • 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

BB30A Standard


  • Shell width: 73mm (Asymmetrical +5mm on Non-Drive Side)
  • Shell inner diameter (ID): 42mm
  • Two 6806 bearings (42mm OD, 30mm ID) pressed directly in frame and stop at removable snap rings
  • Will accept 24mm and 24/22mm cranksets

PF30A Standard

  • Shell width: 73mm (Asymmetrical +5mm on Non-Drive Side)
  • Shell inner diameter (ID): 46mm
  • Two 6806 bearings (42mm OD, 30mm ID) pressed into alloy cups which are pressed into frame
  • Accepts Wheels Mfg PF30 Bottom Brackets
  • Will accept 24mm and 24/22mm cranksets

Specialized OSBB Alloy Standard


  • Shell width: 68mm (road) or 73mm (mountain)
  • Shell inner diameter (ID): 42mm
  • Two 6806 bearings (42mm OD, 30mm ID) pressed directly in frame and stop at removable snap rings
  • Accepts 30mm spindle cranks
  • Accepts 24mm and 22/24mm cranks with separate adapters

Specialized OSBB Carbon Standard

  • Shell Width: 61mm (road)
  • Shell inner diameter (ID): 46mm
  • Uses 6806 bearings (42mm OD, 30mm ID) contained inside cups and the cups are pressed into the frame
  • The frame’s bottom bracket shell will have a smooth bore (no snap ring grooves)
  • When using standard PF30 or PF30 Outboard bottom bracket, you must use the 3.5mm spacers as shown.

BBRIGHT™ Standard


  • Shell width: 79mm (Asymmetrical +11mm on Non-Drive Side)
  • Shell inner diameter (ID): 46mm
  • Two 6806 bearings (42mm OD, 30mm ID) pressed into alloy cups which are pressed into frame
  • Accepts Wheels Mfg PF30 & BBRIGHT-OUT Bottom Brackets

386EVO, 392EVO Standard

  • Shell width: 86mm, 92mm
  • Shell inner diameter (ID): 46mm
  • Two 6806 bearings (42mm OD, 30mm ID) pressed into alloy cups which are pressed into frame
  • Accepts Wheels Mfg 386EVO Bottom Brackets

PF41 Fat Bike Bottom Brackets


  • Bearings: Enduro ABEC-3, Angular Contact
  • Color: Black
  • Bottom Bracket/Frame Interface: PF41 – BB121, PF41 – BB132
  • Bottom Bracket Shell Width: 121mm – 132mm
  • Bottom Bracket Shell I.D.: 41mm
  • Crank Spindle Diameter: 24mm or 22/24mm

PF46 Fat Bike Bottom Brackets

  • Bearings: Enduro ABEC-3, Angular Contact
  • Color: Black
  • Bottom Bracket/Frame Interface: PF30
  • Bottom Bracket Shell Width: 100mm – 121mm
  • Bottom Bracket Shell I.D.: 46mm
  • Crank Spindle Diameter: 30mm

T47 Standard


  • Shell widths: 68mm, 73mm, 84mm, 86.5mm, 92mm, 100mm, 121mm
  • Shell inner diameter (ID): M47x1.0 Threaded
  • Individual Cups thread directly into frame
  • Drive side = Left Hand threads
  • Non-Drive side = Right Hand Threads
  • Accepts 24mm and 22/24mm cranks
  • Accepts 30mm spindle cranks

Eccentric Bottom Brackets

  • Bearings: Enduro Angular Contact
  • Bottom Bracket/Frame Interface: PF30
  • Bottom Bracket Shell Width: 68 mm 73 mm
  • Bottom Bracket Shell I.D.: 46mm

BB90/95 Trek Bottom Bracket


  • Shell width: 90.5mm (road) or 95.5mm (mountain)
  • Shell inner diameter (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 22/24mm spindle cranks originally intended for use with external cup bottom brackets (Shimano HollowTech II, SRAM GXP)

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