I don't think the TSX tubes were heat treated but both the top tube and down tube were also a little thinner, 0.8/0.6 rather than 0.9/0.6 of the SLX. Hilary Stone
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Dale wrote:
> Lee points out the difference..
>
> SLX and TSX are exactly the same except for TSX's full length long ribbing in
> 2 tubes, top & down.
>
> No heat treating at all from Columbus until much later...
>
> There was a Nuovo SLX set introduced a few years back that supposedly had
> shorter butts and was aimed at (surprise!) Tig welding...