• I'm not quite sure I get the point of having frames that can be bought at 1cm difference - for example, 55cm/56/57/58/etc. Surely if you raise the seat higher it would correct the smaller frame. Or is it more to do with the geometry? If that is so, then surely if you bought a frame that was too small, but the geometry would allow for the seat height to correct the size then you don't need to buy such a specific size.
    Also, the size always seems to be written down in terms of the seattube, but surely the size of the toptube is more important?

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