STD tube frames, 1” top tube and 1.125” seat and down tube, are rare these days. One could go so far as to say that Oversize (OS) is the new standard – and has been for the last 15 years or so. There are lugs available for Super OS diameters as well these days: 1.25” top and seat tubes, and 1.375” down tube. Lots of choices.
In terms of stiffness/weight; as the tubes get larger, and thinner, the stiffness can remain constant while weight is reduced. For example, an OS frame with similar stiffness to a STD frame will weigh about ¼ - 1/3 lb. lighter. The key is to pick a tubeset to match the ride qualities you want. A couple of good ones for general purpose riding are Columbus Zona and Dedacciai COM12.5 (ZeroUno). Both will build into a lighter frame than the typical Columbus SL frame, while being slightly stiffer as well. One drawback to thin walled tubes needs to be considered: they dent more easily than thicker tubes. The thin tubes are made from stronger alloys, so the metal alloy is more dent resistant, but this does not fully make up for the fact that the tubes are thinner, thus they dent easier.
My own personal bikes (two of them) use Super OS tubes. I really like these bikes since they are stiffer than a similar weight OS frame. I’m not super strong, or heavy, but I hate chain rub so stiffness is important to me.
Hope this helps.
Last edited by Nessism; 10-10-08 at 08:55 PM.