Originally Posted by
Schwinnsta
But you can't tell that. First they are roughly the same strength steel and titanium. Second, they may use the same outer dimension and not the same inner dimension. Buying Chinese Ti is though a pig in a poke. I guess on eBay you could go by Sellers feedback buy that is not that reliable.
Indeed, I don't know.
But I doubt they made a real study of their frame design to compute what type/dimension of tubes are needed.
Also, nobody knows the quality of the welding which is crucial for a titanium frame.
I also had several bad experiences with Brompton third party components (including the very expensive brands) giving the impression that the designer/manufacturer actually never tested their components.