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  1. #1
    Converted Marathon Runner
    Reputation: 10kman's Avatar
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    How does Specialized measure their frames?

    Does anyone know how Specialized measures their frames, specifically the top tube? They have everything else except that one measurement well-documented on their site.

    Center to center? Center to top? All it says is "measured horizontally".......

    TIA,

    10k

    PS - for an S-works E5

  2. #2
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    I think they use a tape measure.

    Quote Originally Posted by 10kman
    Does anyone know how Specialized measures their frames, specifically the top tube? They have everything else except that one measurement well-documented on their site.
    Sorry, couldn't resist. Figured that if I couldn't be helpful, I could at least be annoying.

  3. #3
    Old and Fixed, Moderator
    Reputation: Dave Hickey's Avatar
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    Quote Originally Posted by 10kman
    Does anyone know how Specialized measures their frames, specifically the top tube? They have everything else except that one measurement well-documented on their site.

    Center to center? Center to top? All it says is "measured horizontally".......

    TIA,

    10k

    PS - for an S-works E5
    I believe they are measure with a virtual top tube. A lot of compact frame are measured that way. Draw a horizontal line from the top of the headtube back to where the seat post would intersect. In other words, a "52cm" frame would have around a 45-46cm actual seat tube.
    Dave Hickey/ Fort Worth

    My 3Rensho Blog: http://vintage3rensholove.blogspot.com/

  4. #4
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    horizontal is horizontal...

    Just like any horizontal TT frame, the measurement of TT length is always from the center of the head tube/top tube junction, horizontally to the point where the seat tube and TT would intersect IF it was horizontal, like a standard frame.

    Some other brands call this a "virtual" TT length. Horizontal is the better term.

  5. #5
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    Center to center, sort of

    Top tubes are measured ctc, unlike the various goofy concepts on seat tubes. The caveat here is with sloping top tubes, where some measure ctc on a horizontal line, and others (only a very few) measure the actual tube, ctc. You can be "virtually" certain that Specialized measures ctc on a horizontal line. Look for a geometry chart on their web site or catalog, where they will often have a frame graphic showing their measurement points.

  6. #6
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    Right off the E5 Geometry Chart

    Quote Originally Posted by 10kman
    for an S-works E5
    Size 50 52 54 55 56 57 58 60 62

    Stand Over Height 706 729 749 760 772 784 794 811 827

    Seat Tube Length (center-to-top) 430 480 500 510 520 530 540 560 580

    Top Tube Length (measured horizontally) 525 537 548 557 565 573 582 591 605


    It's not on the E5 chart but on others they have this note

    * TT is measured horizontally from center of HT to center of ST

    HTH
    Scot
    Scot Gore, Minneapolis

  7. #7
    Converted Marathon Runner
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    Follow up.....

    FWIW, I followed up on this, and got 2 final words....

    Measured Center to Center, along a "virtual horizontal", much like the post above states.

    I wish they'd standardize this stuff, I mean seriously, why does everything have to involve more research than necessary??

    Thanks all for the help, and I hope this helps others in the future.

    10k

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