quite a long while a go now there was such thing as a threaded steerer tube so there was thread in the steerer tube so they needed thread on the headset to screw on down.
have a look on tartybikes at the monty 221 ti rear rim its quite cheap heres the link http://www.tartybikes.co.uk/product.php?id=2155 and what i ahve herd of them they are quite strong.