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Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

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Old 08-13-09, 03:59 PM   #1
Dominion
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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!
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Old 08-13-09, 04:08 PM   #2
merlin55
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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
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Old 08-13-09, 04:08 PM   #3
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Thanks, that cleared up all my confusion
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