I'm still fiddling with the rear but it's the same topic. Vintage rear wheels measures 10 9/32" on ouside of rim. They are 9 3/8" on inside of rim. They measure without the adapter at 4 1/16" backspace. That makes an offset of 1.078". I have a bunch of numbers which I'll regurgitate shortly. I'm working off a 56" track which is what every piece of litereature but one says. I think the flange to flange is listed as track on the odd one out at 55 1/8" racing. Still looking for comments and opinions. I will do my maths on the rear hub offsets for these wheels after I quadruple check my numbers
you soon will be.