Here is a section of the email sent to me.
- These tubes have a very low carbon content (30%) and diameter is only Ø44mm as opposed to our Ø50mm. Nett result of both these facts is that they're only ~half the stiffness.
As I said, I prefer not to mention the company, and ask that there is no speculation online. I'm sure that they're not slagging off, more pointing out their USP.