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Frame sizing(3 posts)

Frame sizingWiaruz
Dec 23, 2003 1:13 PM
When people quote frame sizes in relation to the seat tube length, are they usually referring to the centre-to-centre measurement or centre-to-top (of seat tube)?
Both, and then someDropped
Dec 23, 2003 1:55 PM
Some bike makers give the measurements c-c, others c-top of the top tube, and still others c-top of the seat collar. Some provide a couple of these measurements (e.g. Colnago's geometry charts).

So, when evaluating the size of a frame, you always want to know which way it is measured.
And even moreDave Hickey
Dec 23, 2003 2:08 PM
With compact frames, some manufactures list them with "virtual" seat tubes. The frame might have a 45cm seat tube but it fits like a 52cm so they list it as a 52cm