Chris King's press fit bottom brackets are arguably the smoothest, most durable options in the entire universe of PF30, but if your crankset has a spindle smaller than 30mm, you'll need a conversion kit to span the gap. If you need to affix your GXP 2422mm crankset to your 73mm PF30 equipped frame, the Chris King BB Conversion Kit 3 is exactly what you're looking for.This conversion kit adapts a Chris King PF30 bottom bracket to use with a GXP standard crankset, for a 73mm PF30 frame. If your frame has a 68mm PF30 shell, you'll need the Conversion Kit 4 instead. Please note that the Chris King PF30 bottom bracket is sold separately. The Chris King BB Conversion Kit 3 is available in the color Black, and one size.