Originally Posted by
LesterOfPuppets
High Tensile steel frames are bound to be very flexy, quite heavy, or both, regardless of toptube angle.
No, the stiffness of any steel tube really only depends on its diameter. But a high-tensile steel tube will not be as strong as a chrome-moly or manganese-moly tube of the same diameter, so it is likely to have thicker walls to compensate, and therefore will be heavier.