Basically, Cromor was similar to Reynolds 501; i.e. seamed tubing that has been chemically treated to restore strength at the seam, so that it is close in quality to a seamless tube. Anyway, that's the theory. Many people depricate this tubing, although I wonder if these folks have ever ridden on the stuff. I put many miles on both Cromor and 501 bikes and found them acceptable and only slightly heavier than SL or 531 - at least in my frame size (52cm). The differences might be magnified as the frame size increases, though. As for Columbus Matrix, I'll have to defer to someone with actual riding experience... Cheers, Fred
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