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Old 05-06-18, 05:49 PM
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Join Date: Apr 2006
Location: Tucson, AZ
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Bikes: Road, mountain and track bikes and tandems.

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5o cm bike size is usually the seat tube length. With a lot of the newer road bikes with the slanted top tubes it gets a little complicated. The have this sizing called virtual sizing where the claim the size by where the top tube would be on a straight across plane from the top of the head tube. So, when you ask what rider size for a 50 cm seat tube, it is going to depend on if it has a flat top tube or slanted. There are other considerations with frame sizing such as top tube length and head tube size. The headtube size has to do with how upright you want to be.
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