Me? no, I'm 5'6", I ride frames 53 cm through 56, though that is usually a stretch.

The frame in question will have tubing of unstated origin. If it was actually Reynolds it would have been bragged about, considering the low price point. This company has a kind of "plain brown wrapper" feel. The manufacturer will say the guage and OD, but so far not the alloy, heat treating, or sourcing.

Correct me if I'm wrong, but heat treating does not change the modulus of elasticity (i.e. stiffness) of an alloy or a tube. It increases the yield strength, but not the modulus of elasticity. My reason for wanting heat treating is to reduce the likelihood of denting - improve reliability and durability. I don't expect it to improve the ride quality or liveliness.

In any case, I mentioned 531 (Competition, not the super-light stuff) and 753 (same guage as the super-light, lighter than the Competition, and still heavier than what my manufacturer is planning) to illustrate the lightness of the tubing he is planning to use.

I'm not too concerned about the thin walls - I think one man's noodly is another man's responsive.