Honestly there is no good reason (except for looks) to convert from threadless to threaded. Threadless is far better and stiffer.

That being said I don't see the issue. If you are staying with the same diameter (most likely 1" )then all you need is a new stem and headset. Take the fork down to your LBS and have them thread it.

I would avoid this if you have a 1 1/8 headtube. Threaded 1 1/8 headset are hard to find as are stems.


-cheers