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  1. #1
    Senior Member hodadmike's Avatar
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    Traditional vs. compact sizing

    Could someone clear up a newbie question? All my road bikes have traditional flat top tube frames, either 57 or 58 cm. seat tube length. If I wanted a similar fit in a compact frame, generaly speaking, am i looking for a 55 or 56?

  2. #2
    Senior Member Stubacca's Avatar
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    Depends how they measure it. Some manufacturers measure compact frames on the actual seat tube length (which could be center of bottom bracket-to-center or top/seat tube junction, center-to-top of seat tube, or center-to-top edge of top tube), and others give a virtual seat tube measurement (how long the seat tube would be if it intersected with a horizontal top tube).

    I'd pay more attention to the virtual top tube length (length that the top tube would be if it were horizontal). For me, that's always been far more important. The compact frames I've felt most comfortable on are those where the virtual top tube length is about the same as the top tube length I ride on a traditional geometry frame.

  3. #3
    Senior Member hodadmike's Avatar
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    That makes sense, saddle to handlebar measurment would be similar. You could make up any saddle to pedal distance with a longer seatpost.

  4. #4
    Senior Member onbike 1939's Avatar
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    Quote Originally Posted by Stubacca
    Depends how they measure it. Some manufacturers measure compact frames on the actual seat tube length (which could be center of bottom bracket-to-center or top/seat tube junction, center-to-top of seat tube, or center-to-top edge of top tube), and others give a virtual seat tube measurement (how long the seat tube would be if it intersected with a horizontal top tube).

    I'd pay more attention to the virtual top tube length (length that the top tube would be if it were horizontal). For me, that's always been far more important. The compact frames I've felt most comfortable on are those where the virtual top tube length is about the same as the top tube length I ride on a traditional geometry frame.
    +1
    Dead on!

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