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Columbus foco/megatube: who uses them?(4 posts)

Columbus foco/megatube: who uses them?opencl
Oct 29, 2002 8:24 PM
which manufacturers out there use the Columbus foco tubeset with a megatube downtube? What are the advantages of a megatube vs. a regular round tube? Thanks
re: Columbus foco/megatube: who uses them?waynebo
Oct 30, 2002 8:38 AM
I've got a Strong (strongracing.com) with a Foco megatube. Supposedly, it increases stiffness and it is one way to offset the thinness of the tubeset and allowing a heavier rider to use Foco. Also, there is the visual appeal. I paid an extra $50 and don't regret it but I don't think it really is necessary. Tommasini also uses the megatube and probably most makers offer it as a custom option or the frame is already built with the megatube design.
re: Columbus foco/megatube: who uses them?DaveG
Oct 30, 2002 9:21 AM
I can't speak to Foco but I have a bike with a Brain tubeset (Marin) and another with Zona (Torelli) that use megatubes. I can't say that I notice a difference. I suspect there is some marketing-influenced engineering going on here. The Columbus website discusses the alleged benifits of the megatube design
Columbus foco/megatube: who uses them?sprockets2
Oct 30, 2002 12:00 PM
When I was looking for a steel frame I found that a number of builders would use the tubeset if they thought that it was required. My guess is that smaller frames and frames for casual or spinning focused riders may not need the benefits of a megatube as much as a big cruncher. Interestingly, some MTB frames have tube sections that approximate the design of the megatube. I see it as a benefit to riders of my size and tendencies, but I am also prepared to pay the weight penalty that is incurred.

If you have ever seen a computer depiction of the stresses on a downtube, you are surprised at once at how many different forces there are and how many surprising directions they act in. The large numbers of oversized and/or shaped downtubes on more expensive bikes indicates that the manufacturers are addressing the stresses on the tube by going beyond the circular cross-section and putting material where it is most needed. The megatube seems to duplicate some of the profiles and designs that you see in the complicated looking downtubes in many bikes. It would probably be even more complex if that particular alloy were easier to work.