I know that most of the vintage road bikes have a rear spacing of 126mm to accomodate 6spd freewheel drivetrains. However, I was reading this thread:

http://www.bikeforums.net/showthread...-an-older-bike

and it seems like I can squeeze in a 9 speed cassette? There are a lot more wheel choices and 700c wheelsets available in my area so I'm asking for future refence.

http://seattle.craigslist.org/oly/bik/3248049275.html