Originally Posted by fmw
A pair of rims arrived today. They are called Mavic Open 4CD. What makes them strange is that they don't have the nice wide machined braking surface most rims have. In fact the braking surface isn't any more than about 10-12 mm wide. The rims themselves are hard anodized. What do I have? Track rims, perhaps?
Early '90s road rims. Machined brake surfaces weren't common until the late '90s. I'd bet the seam is pinned instead of welded.