Originally Posted by
FBinNY
34mm would be 7 speed, but it seems you already know that (if that's the original in the 2nd photo)
The picture is my bike. It's a Shimano 600 piece. I am having troubles with some shifting and others on the forum recommended I get a new HyperGlide one.
How do I know if it's the original? I bought the bike like this. The frame is from the early 80's, and most parts seem to be from the late 80's. I really don't know the vintage of the hubs though.