You might want to bookmark this one too, if you haven't already:

http://sheldonbrown.com/velos.html

Also, get a caliper to confirm or refute your size suspicions. You can get a plastic one at Harboer Freight for about $2 or one that's accurate enough to be useful for about $20.



I've got '77 Gitane that turned out to have almost entirely standard threading and sizing. Assume nothing.