The CK GXP adapter is a bit weird - you get a drive side axle spacer with it, too.
http://chrisking.com/files/images/bottombracket/stepped_BB_nvy.jpg
http://fcdn.mtbr.com/attachments/drivetrain-shifters-derailleurs-cranks/794383d1367108558t-king-gxp-bb-xx1-crank-wont-tighten-enough-photo.jpg
Why use a CK 24mm BB anyway? Nothing wrong with standard GPX and they are peanuts to replace.
@Howard started
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The CK GXP adapter is a bit weird - you get a drive side axle spacer with it, too.
http://chrisking.com/files/images/bottombracket/stepped_BB_nvy.jpg
http://fcdn.mtbr.com/attachments/drivetrain-shifters-derailleurs-cranks/794383d1367108558t-king-gxp-bb-xx1-crank-wont-tighten-enough-photo.jpg
Why use a CK 24mm BB anyway? Nothing wrong with standard GPX and they are peanuts to replace.