I want to build a 1930's replica frame of a typical bike used in the Tour de France. Is there a database or website that has tube lengths, frame angles, fork offset, etc.?? Any help is appreciated.

C&V here in Bike Forums might be a better group to ask. Also Bicycle Quarterly has published many older bike's geometry. Andy

Good idea. Will post there as well.

One of BQ's books has rough drawings in the back of the book showing some geometric dimensions. I think it might be the Competition bicycles book.

I actually have some back issues of BQ. Will look through them some time if asked. Andy

If you have a straight side view of a bike, you should be able to estimate seat tube angle and head tube angles.

And, if you know the wheel sizes, you should be able to calculate lengths pretty close too.

Hopefully Jan won't feel that I'm infringing. Here are pictures from the book with a cover shot. Go buy the book. It's well worth the price. Interestingly, by 1935, the geometry isn't really that far off of what we ride today.

I have wanted to build older style frames. I think that it is good that your goal is on just having a vintage frame. What always stops me, is what to do about the whole bike vintage bike parts specification, I always end up wanting to put some relatively newer parts on it. Also; What do you plan to do about labeling it, as what brand, or just a label-less generica? Maybe, I should have my own post with questions. Haha

Leave off a letter.... "BIANCH"?

There would be choices in the construction too. Cut up some old Schwinns to get High-Ten steel, vs building with new quality double butted thinwall alloys. Make repro lugs? A repro fork crown, however, might be a problem. Unless one goes with the Raleigh welded tube design.

There is an Italian company that still makes wooden rims. They'd be beautiful, although I'm not sure which bikes used wood vs steel. Track?

The 1939 Oscar Egg is the design I originally came up with, except with another cm in the stays. I drew it up before seeing the post, so my guess from pictures was accurate. Yes, the design is hard to distinguish from a modern touring bike!


Edit: The frame is a 58 with 57.5 TT. Trail will be in near 70. I like it to be super stable with wide turns! lol