Cannondale's BB30A standard uses an asymmetric shell that shifts the bottom bracket five millimeters toward the non-drive side, optimizing chainline and rear triangle geometry. The Wheels Manufacturing BB30A Outboard Bottom Bracket matches this specific shell configuration, letting you run Shimano cranksets on your SuperSix, CAAD, or Synapse without adapter stacks that add complexity and potential creak points. The thread-together design addresses the core issue with direct-fit bearings: movement within the shell that causes noise and accelerates wear.

Two machined aluminum cups thread into each other through the 42mm BB30A shell, clamping the assembly in place and eliminating the micro-movement that plagues standard press-fit installations. The 73mm shell width and asymmetric bearing placement mean this bottom bracket fits only Cannondale's BB30A frames, not standard BB30 shells. If you're unsure which standard your frame uses, measure the shell width: BB30A measures 73mm while symmetric BB30 measures 68mm for road applications.

The bottom bracket accepts 24mm spindle diameter cranksets, which covers Shimano's Hollowtech II road cranks from Claris through Dura-Ace. FSA MegaExo cranks also use a nominally 24mm spindle, but some FSA spindles measure 24.07mm rather than true 24.00mm. If your FSA crank spindle falls into that slightly oversize range, the bearings in this bottom bracket won't fit properly. Wheels Manufacturing offers replacement bearings with the correct 24.07mm bore if you need them.... Read More