chuckschmidt@earthlink.net writes: Later, in the 1970s, as different tube sets were offered by Columbus and Reynolds, there would be additional models added to the line. Examples would be Reynolds 531 followed by the lighter, more expensive 753, or Columbus SL followed by the lighter, more expensive SLX etc.
I agree with Chuck's comments about the Masi model line. And, I agree that given same lugsets and only tubing differences that the 753 was lighter (and more expensive) than the 531 bicycle, but I do believe that SLX was actually about 30 grams heavier than the SL frame, given the same set of conditions--only change of tubes. Lou Deeter, Orlando FL