Thread: Noobie Question about Geometry: What is EFF toptube?
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Old 08-13-09 | 04:08 PM
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merlin55
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Joined: May 2008
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From: SoCal
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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