Do you mean Columbus SLX?
SLX was a tubing set first introduced by Columbus in the mid to late 1980s. (I donít have the exact date.) The inside butted section of the tube, usually about 4 inches, had raised spiral re-enforcing ridges. Like the rifling inside a gun barrel, but raised.
If you look down the seat tube you will see the spiral ridges at the bottom bracket end, or you can feel them with your finger from inside the bottom bracket shell. A seat tube is always butted at the one end only, as it has to accommodate the seat post at the top end. Top and down tubes are butted both ends. (Hence the term, double butted.) The chainstays of the SLX set also had the spiral ridges inside.
The SLX tube-set was clamed to be as light as the standard SL tube-set, but stronger. The idea was that the spiral ridges gave the tube a resistance to twisting. Later a TSX tube-set was introduced. The ďTĒ was for Total and the spirals ran the full length inside the top and down tube. Both SLX and TSX were more expensive than the standard SL and at the time were were high end tube-set from Columbus.
Another piece of general information: Top and down tubes (Reynolds and Columbus.) have a longer butted section at one end. This is the end the framebuilder cuts to accommodate different size frames. The short end, which you donít cut, is marked with the makers trade mark. (Columbus: Dove or Oomegooly Bird as I always called it.)
Dave Moulton, ex-framebuilder.
Last edited by Dave Moulton; 01-28-06 at 08:22 AM.