Noobie Question about Geometry: What is EFF toptube?
I'm looking at the trek website
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?
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
Thanks, that cleared up all my confusion