The new Titanium

Echoing chris667 the older tube sets are possibly better suited to bike manufacture. 531 is not too expensive, is resilient and time tested. It is also, so far as I know, the only tube that Reynolds developed for bikes.
 
725 is also very good and seems to be the modern equivalent of 531.

I suspect that the problem with 953 is that the tube sections are optimised for road bikes and that therefore it'll be a bit fragile. There were a fair few 753 one-off MTB frames made in the early days, but the tubes were always a bit thin and the bikes tended to get wrecked after a really big stack.

There are a whole load of new non-rusting steel alloys around now which don't have the cracking problems of stainless. Corten is one of them - it's used for Sea Containers.
 
Never knew that about Baum Andy!

Isn't it just as, if not more expensive than Ti though? Not saying I don't want one...
 
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