My understanding is Titanium has something like 90% of steel with about half the weight (of course some of those exotic alloys catch that up a bit). To compensate for that %10, you use slightly thicker tubing and end up with a lighter and stronger frame. Aluminum is lighter than ti and steel, but it's MUCH less strong, which is why the extra thick tubing is used. They end up heavier than ti bikes and weaker.

I've asked about titanium once and was told it was controversial...and an earlier thread yesterday mentioning it had the same comment. Usually titanium threads don't get many responses. I was told it was controversial by members, so asked why.

I don't own a ti bike because I'm a snob...I own it because I rode one once when I was 14 and have wanted one ever since. It's the exact same reason I just got a De Rosa...it was a really cool bike I couldn't afford as a kid. I couldn't afford it or justify the price, so never got one. I fonally got a killer deal on a used one (92' frame with DA 7600 for $675).