Check out the pictures http://www.americancyclery.com/PHOTOS/
The posters and esp. the racing photos are great. Figure the most recent is from 50 years ago and many are from 70+ years ago. I have occasionally heard about 6 Day Racing in the US but have never seen so many photos in one collection before. Most of the vintage bikes I post about are from my early riding days. This is from a time well before that and now completelt absent from the US sports scene. Very cool stuff.
I got the link from the Classic Renezvous list and hope the shop owners don't mind their links being spread around as I, at least, think it's a great resource for us lovers of the vintage stuff.