I have an old Schwinn, which I believe started life as a Speedster. The bike is rather fun to ride, but it has the stamped steel fork that is a little insecure at anything over 5 mph. Being the tinkerer that I am, I would like to replace the fork with a better one. The tubular Schwinn vintage forks for the Continental (and I assume the Super Sport) are not common. On the other hand I can get my hands on standard Japanese forks easily.

From my reading over at Sheldon’s informative page on American bike parts Parts for older American Bicycles, it looks like the outside diameter of the Schwinn steerer tube is the same as that for Japanese forks. The inside diameter is different, but that is easy to deal with.

Can anyone confirm or dispute my understanding that I can replace the wimpy Schwinn form with a better non-Schwinn fork?