What is the difference between PF30 and PF30A

Pf30 & PF30A - Bicycle Parts Direct

PF30A


PF30A bottom bracket system uses a 73mm wide shell and a 30mm diameter crank spindle. The frame’s bottom bracket shell itself is not threaded, instead the bottom bracket cups press directly into the frame. PF30A frame shell inner diameter is 46mm. The PF30A is similar to the PF30 standard, but the frame BB shell is 5mm wider on the non-drive side. PF30A system uses thin spacers and/or a wave washer between the bearings and the crank arms to take up any slack and micro-adjust the chainline of the crank.

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

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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

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