Old 11-28-07 | 05:35 AM
  #69  
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Road Fan
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From: Ann Arbor, MI

Bikes: 1980 Masi, 1984 Mondonico, 1984 Trek 610, 1980 Woodrup Giro, 2005 Mondonico Futura Leggera ELOS, 1967 PX10E, 1971 Peugeot UO-8

Originally Posted by CharlesC

In reference to Reynolds vs Columbus: "Steel is steel". Maybe yes, maybe no. Back in the day there were many heated debates about the relative merits of the two types of tubing. Both were available, then and now, in various wall thicknesses with corresponding varing ride qualities. My recollection is that racing frame makers tended to chose Columbus tubing with the possible unfounded idea that it was stiffer. I was and am a touring rider and chose Reynolds tubing for my frame sets in wall thicknesses that were appropriate for that use. The Jackson and Roberts frames I rode were made to exact custom design criteria set by the buyers. I don't think I ever rode a standard stock bike from either maker. Ane Deanster04 is right; A Cinelli needs to be seen in the flesh and rode to appreciate these great bikes. They were often heavier than contenporary brands but had a feeling of quality that Colnago, Roberts, Bob Jackson, Claud Butler and the rest of the breed didn't have, in my sorta biased opinion. All were excellent bikes, but Cinelli set the standard.
That said, I have one set each of Columbus SL and SP tubing that I'm dying to make a couple of frames from. I also have a fairly large pile of Reynolds 531 tubing sets, Pragnet lugs of various types, Gargette BB shells, etc. that I need to convert to frames. I'm also thinking about making a superlite all rigid mountain bike frame for us old duffers who don't jump off tall buildings...........
The engineering properties of the two steels (531 and early Columbus CrMO) are very similar in terms of elasticity, which is essentially inherent material flexibility. Tube sets of the same material should test pretty much the same in terms of flex if the diameters and wall thicknesses are the same. Modern steels are stronger but not stiffer. They allow making a thinner-walled tube, which in the classic diameters will make a lighter and more flexible frame. If the diameter is increased it will make a lighter frame that could even be stiffer than vintage SP.

Stiffness is not really the elasticity of the steel, but the design of the tubes, which is constrained by the strength of the steel.

This assumes all other things, such as joining quality and frame design, are equal.

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