Originally Posted by
etristram
Hey, I'm looking at an old shamal wheel with a campagnolo hub and a shimano freehub, and I want to put it on my track bike. Can I just pop off the shimano freehub and screw on a cog and lockring,
No.
or is there more to it than that?
Yes.
Shimano hubs have a splined interface to the freehub which contains ratchet teeth and pawls. You can remove them and use a Surly Fixxer which interfaces to standard threaded cogs and lock rings.
Campagnolo freehubs have the ratchet teeth in the hub body and pawls on the freehub body so they can't be converted.