Thanks to all for the information. It helps.

To be a bit more specific, the frame that I’m working on is a late ‘40’s Schwinn lightweight. As Frank Schwinn’s inspiration to build lightweights is said to have come from a trip to England in the 1930’s, it makes logical sense that he may have followed the English practice on this.

Scarcity of original parts is why I’m searching for an alternative. I’ve read about cold setting frames due to changes in rear hub spacing but question whether 10mm on a 90mm fork is too much. I have no reason for this other than a gut instinct. If it makes a difference, the forks are chrome moly tubing, not the heavy, seemingly indestructible, high carbon steel commonly used later on.

I’d like to go back to daffydd’s comment that bolt on wheels can usually be made to fit. Would the process be to replace the stock lock nuts with something narrower? So, for example, if I had a bolt on Campagnolo track hub, I could hypothetically, narrow the spacing by replacing the lock nuts or some other component?

Thanks again for the help.

Alan