Originally Posted by Gonzo Bob
Look on the end of the freehub body. Some Shimano freehubs that have the Uniglide external threading also have the internal threading for a Hyperglide lockring. If yours does, it will likely be a 8/9-speed hub. My Ultegra hubs from the mid-90s have this "duality" but I don't know if Dura-ace ever did.
No, this was never done in the Dura-Ace line.
It was not possible due to the smaller diameter of the Dura-Ace Uniglide thread.
Sheldon "http://sheldonbrown.com/dura-ace" Brown
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