The Chris King BB Conversion Kit 2 adapts your 24mm mountain crankset to your PF30 frame. And that means that you can run the smoothest, longest lasting press fit bottom brackets on the planet, without giving up your drivetrain of choice. This conversion kit adapts a Chris King PF30 bottom bracket to use with a 24mm crankset in a PF30 frame. It's compatible with both 68mm and 73mm bottom bracket shells. Please note that the Chris King PF30 bottom bracket is sold separately. The Chris King BB Conversion Kit 2 is available in the color Black, and one size.