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  1. #1
    Junior Member
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    Joe Murray TBG Cascade Lava Dome
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    Noobie Question about Geometry: What is EFF toptube?

    I'm looking at the trek website

    http://www.trekbikes.com/ca/en/bikes...es/elite99ssl/

    When looking at the geometry specs, I'm unclear what the EFF top tube is. I understand a top tube is the tube that goes from top of head tube to seat tube. What does the EFF mean?

    Thanks!

  2. #2
    Senior Member
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    Effective TT length, from the center of the head tube to the ceter line of the seat tube/seatpost MEASURED ON THE HORIZONTAL....as many frame now have sloping top tubes

  3. #3
    Junior Member
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    Thanks, that cleared up all my confusion

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