531 hubs
Thought I might add this, just for the porn content. These are the 100/135mm freewheel (obviously) versions that I sourced separately, and have been hanging onto for years, waiting for a worthy project on which to use them. I finally found one, and just recently built them into a set of wheels. I bought a pair of 100/130mm wide versions in 1990, and used them for a couple of hard-riding but trouble-free decades. Those ones still spin smooth to this day. With the super-lightweight aluminum axle, I don't know that these wider ones will take as much abuse, but who knows. They also had a proprietary cassette version, and I've heard the freehub can be replaced with a shimano unit, using a little ingenuity.
