Originally Posted by
Countdown48
A Reynolds ozou comp 1" threadless fork came up on my local Craigslist. The bike it is for is my litespeed ultimate. While the current carbon fork woks fine, it's an ugly green and has always bothered me a little. That's why I'm curious if I could keep my original headset. I looked at ebay and decent 1" threadless headsets are pretty pricy. There are some cheap ones but I didn't want to downgrade the headset just to fit the fork. I thought of I could just replace the adjustable race, I could get a fork upgrade without breaking the bank.
This makes more sense. Short answer: no, I don't think so. To repeat what I said above, it's unlikely you'll find a threadless bearing/top assembly to match your existing Shimano 600 adjustable race. Either way, you'll still need at least a couple bits of a threadless headset to make this work. So you might as well get the whole thing.
The "complete" way to do this is to replace the whole headset. But there is certainly nothing wrong with keeping the bottom half of your current headset and just replacing the top pieces including the pressed in cup.
If you can swallow your pride I have used these Ritchey Logic threadless headsets a number of times and they work just fine. But I admit they are quite ugly.
Ritchey Logic Threadless 1" Headset 1 inch Starnut | eBay