Re:
It's not a very good illustration, here's a better one:
A butted tube is actually thinned in the middle, rather than being thicker at the ends if you see what I mean.
You can get some quite fancy stuff too, like this ribbed Tange Ultimate Ultrastrong tubing:
It's not a very good illustration, here's a better one:
A butted tube is actually thinned in the middle, rather than being thicker at the ends if you see what I mean.
You can get some quite fancy stuff too, like this ribbed Tange Ultimate Ultrastrong tubing: