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How real is a tall head tube to ride?
In article ,
Artoi wrote: In article , "Phil Holman" piholmanc@yourservice wrote: "Artoi" wrote in message ... With Paris-Roubaix, everyone's talking about the value of "relaxed" frame geometry again, specifically the long head tube and the benefits they bring. My question is, what ride differences are there b/n a frame with a longer head tube and a regular road frame that has more spacers inserted below the stem, thereby achieving a longer virtual head tube? I've asked this question a number of times elsewhere and no one seemed to be able to answer it directly. -- I've never ridden cobbles very far but for normal road riding a longer head tube will result in a frame that is torsionally softer. Think of a twisted frame with the top tube and down tube out of plane. A shorter head tube is torsionally stiffer than a long head tube and will resist this kind of flex. The closer the top tube is to the down tube where they connect to the head tube, the stiffer the frame (all other things being equal). Adding spacers will achieve a taller geometry without affecting frame flex and handling. The worst affect of torsional flexing is in the handling of the bike where the wheels go out of alignment (head tube out of plane with seat tube) and the bike does not track well. This makes sense. So in other words, what people/companies refers to as "relaxed geometry" is actually one that is a torsionally less stiff frame. Then the issue here is, why would it be considered to be more comfortable? By comfortable I would have assumed its more vertically compliant. Frames in this category include Giant's OCR range, Specialized Roubaix range etc. A frame fit for long rough rides has very long chain stays, and 70 degree head tube angle. The fork has a large offset with the offset residing in a curve near the tips. The fork blades are thick at the crown and gradually taper to very thin at the tips. -- Michael Press |
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#12
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How real is a tall head tube to ride?
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#13
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How real is a tall head tube to ride?
datakoll aka gene daniels wrote:
[...] anyway ignore this post.[...] No. -- Tom Sherman - Holstein-Friesland Bovinia The weather is here, wish you were beautiful |
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How real is a tall head tube to ride?
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