What is the difference between BB30 and BB30A

What is the difference between BB30 and BB30A - Bicycle Parts Direct

BB30A


BB30A 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 bearings press directly into the frame. BB30A frame shell inner diameter is 42mm, has two bearing retaining clips and two 6806 sealed bearings pressed directly in the shell.

The BB30A is similar to the BB30 standard, but the frame BB shell is 5mm wider on the non-drive side. BB30A 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.

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

Shop BB30 Now


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


Shop BB30A Now


How to select a bottom bracket.

Learn More


 
0
PageLines