Originally Posted by KonAaron Snake

I'm reasonably sure what was written here about TSX is inaccurate as far as thicker walled. It's thinner walled than SL, and even SLX was, with more of the rifling reinforcing the tubes. As memory serves it was about the same weight, if not a bit lighter. The main reason it's not regarded that well is because it wasn't around for long...quickly replaced with the Nivachrome tubes. Basically it has the rifling SLX has throughout the tubes. Miyata did similar stuff with some of their tubing.

It's rep was as being stiffer than SLX, but I doubt most folks could tell it from SLX blind folded (another reason it didn't sell that well or long).

Edit - it's between SLX and SL weight...and it's thinner walled:

The Bicycle Info Project :: Columbus tubing chart