What I meanis this: steel weakens with repeted flex over time( I think it's called modulus of elastisity). If you flex a paper clip over and over it'll eventually break, even if you don't flex it very much. Titanium though can be flexed up to a point without any damage, for ever. Stay under that flex amount, and it'll never fail. if the frame is straight, and has no noticable flaws, it's probably fine.