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#1
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Why two top tubes ?
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#2
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Why two top tubes ?
Rik O'Shea wrote:
Why two top tubes ? http://tinyurl.com/37sbwo Two tubes are better than one: http://tinyurl.com/2wghpd |
#3
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Why two top tubes ?
On Oct 25, 6:18 am, Rik O'Shea wrote:
Why two top tubes ? http://tinyurl.com/37sbwo They must have given up on the "laterally stiff but vertically compliant" nonsense. |
#5
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Why two top tubes ?
Coaster wrote:
wrote: On Oct 25, 6:18 am, Rik O'Shea wrote: Why two top tubes ? http://tinyurl.com/37sbwo They must have given up on the "laterally stiff but vertically compliant" nonsense. English roadsters 24.5" frames "for the taller gent" were built with double top tubes. Tradition? IMHO they wanted to make stiffier frame... C. NIce bike with double TT: http://www.uscoles.com/bikepix/073stpashleyl.jpg C. |
#6
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Why two top tubes ?
Rik O'Shea wrote:
Why two top tubes ? http://tinyurl.com/37sbwo two tubes are twice as stiff as a single tube It's easy to build as you can use the same tubes and lugs (with a bit of grinding on the seatlugears) -- /Marten info(apestaartje)m-gineering(punt)nl |
#7
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Why two top tubes ?
Rik O'Shea schreef :
Why two top tubes ? http://tinyurl.com/37sbwo A strong man needs a strong bike! http://picasaweb.google.com/koertmar...59047640721090 Koert |
#8
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Why two top tubes ?
On Oct 25, 8:40 am, M-gineering wrote:
Rik O'Shea wrote: Why two top tubes ? http://tinyurl.com/37sbwo two tubes are twice as stiff as a single tube It's easy to build as you can use the same tubes and lugs (with a bit of grinding on the seatlugears) -- /Marten info(apestaartje)m-gineering(punt)nl Well, about 30% stiffer laterally, and way stiffer vertically depending on the geometry. The question is, why double the top tube? The down tube makes much more sense. |
#9
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Why two top tubes ?
On Oct 25, 6:18 am, Rik O'Shea wrote:
Why two top tubes ? http://tinyurl.com/37sbwo wrote: They must have given up on the "laterally stiff but vertically compliant" nonsense. Coaster wrote: English roadsters 24.5" frames "for the taller gent" were built with double top tubes. Tradition? IMHO they wanted to make stiffier frame... Raleighs were built both with single and with double top tubes, the dual top tube version not sold in USA. I tried to add some to a container of bikes. They declined even though they were shipping dual tube models to selected 3d world markets at the time. Raleigh's official statement, "It's fashion". -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971 |
#10
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Why two top tubes ?
On Thu, 25 Oct 2007 10:18:15 -0000, Rik O'Shea
wrote: Why two top tubes ? http://tinyurl.com/37sbwo Dear Rik, Partly for style, since double top tubes were popular around 1910: http://www.fixedgeargallery.com/morley/04.jpg http://www.fixedgeargallery.com/morley/06.jpg Partly for strength for carrying loads slung across the top tube, a popular habit in what the caption refers to as developing countries, where riders may sling 200-300 pounds of cargo across the top tube and trundle down a bumpy dirt road. Cheers, Carl Fogel |
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