Framebuilders - Noobie Question about Geometry: What is EFF toptube?

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Dominion
08-13-09, 04:59 PM
I'm looking at the trek website

http://www.trekbikes.com/ca/en/bikes/mountain_hardtail/9_series/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!

merlin55
08-13-09, 05:08 PM
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
Dominion
08-13-09, 05:08 PM
Thanks, that cleared up all my confusion :)