Paragon and Nova both sell the crown race rings. See the supplier thread at the top of the forum. Any steel plate will do for the dropouts. I wouldn't worry about the weight, go with straight gauge for the tubes. The steerers can be bought from Nova, I don't know if they have a keyway or not. The tubing caps are non-critical, so washers would work but don't use galvanized.
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Tomknox- You want a small interference fit between the, brazed onto the fork, crown race seat and the crown race. So a head set crown race with a 27.0mm ID would want a seat with a 27.1 (or there abouts) OD. The 26.43/9 seat is for races of 26.4 (the "Campy" standard). Some seats are available in a larger size that is then, after brazing, machined down to the needed OD. Or you could make your own on a lathe. Andy.
Thanks for the reply Andrew! Being that it's old 80's bmx sizing i kinda figured that something would have to made because everything is modern sized nowadays. As for the "brazing", i was thinking it just needs welding, are you saying it need's both?
In this case, would you recommend i have the crown welded on the steerer tube first and then have it lathed?
I was assuming your fork was 1", which is still used on custom steel bikes. There were a few 1 1/8" threaded steerers, but they are rare. Paragon says you need to have brazing under the crown ring or it will eventually break. I assume this is from long, sad experience. I'm sure a lot of forks were built with just the weld.
Unter: Yes it's the old 1'' steerer, not saying that the company that made them(cyclecraft) didn't know better but i highly doubt they brazed under it. There is no sign of it if they did, back then they probably just welded it on and sent it down the road! Paragon refers to cane creek's research, i'm not sure but i don't think they even existed back when these were built, don't quote me on that though. I'm assuming that i will need to mill down the stock crown from Paragon, whatcha think??
Last edited by tomknox; 09-19-12 at 01:40 PM.