BMX headset issues
here's the story. i have an old beat-up Hutch Trick Star frame. the fork is gone, as is the headset, except the 2 cups still in the frame. i would like to be able to build this up, not as a "restoration" since it ain't pretty, but just as a usable bike. thing is, i have very little experience on BMX bikes.
i know that old BMX threaded headsets are unique. I have an old threaded fork that should work for the bike, but obviously i can't just throw on any headset. to the best of my understanding (correct me if i'm wrong...) the differences between a BMX headset and an ISO headset are the diameter of the cups sitting in the headtube, and the inside diameter of the steer tube (i.e. the stem size). i THINK the outside diameter of the steer tube is the same as ISO standard, as is the crown race. so would it be possible to get a 1" crown race and 1" threaded top race and use them with the existing BMX cups? (provided nothing rubs, etc). also, are the bearing rings a unique diameter?