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Frame shapes
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06-08-09, 11:20 AM
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johnwilson09
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Frame shapes
This isn't a specific issue, more a pondering I hope someone might be able to answer! What are the reasons for differently-shaped top and down tubes on road bicycle frames? They can be straight, curved or tapered, with either a circular, triangular or square cross-section. These can be in different combinations on different bikes (as shown in the following images). Is this purely stylistic, or does it have some functional importance?
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