Cannondale BB Technical Info

BB30A

Cannondale's 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.

Shimano HollowTech II and GXP cranks can be used in a BB30a frame when using our BB Adapters.

  • Shell width: 73mm
  • Shell inner diameter (ID): 42mm
  • Two 6806 bearings (42mm OD, 30mm ID) pressed directly in frame and stop at removable snap rings
  • Designed specifically for Cannondale SISL2 HollowGram cranks
  • Accepts 24mm and 22/24mm cranks with our BB Adapters

BB30a Exploded View

 


PF30A

Cannondale's 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.

  • Shell width: 73mm
  • Shell inner diameter (ID): 46mm
  • Two 6806 bearings (42mm OD, 30mm ID) pressed in cups
  • Designed specifically for Cannondale SISL2 HollowGram cranks
  • Run 24mm diameter cranks (Shimano, FSA) with Wheels Mfg Adapters
  • Run 22/24mm diameter cranks (SRAM, Truvativ) with Wheels Mfg Universal GXP Adapters

PF30a Exploded View

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