CEEPO USA wrote:
Not true at all. I designed that bike and it uses the SAME Toray carbon as other bikes. And on frame deflection is tests much higher than most due to the construction method. It's not an SL version so not as light but it is plenty stiff in the BB area.
We took video at 120 fps of the Kestrel 4000 and compared it to a number of entry-level options with the same rider, same saddle height, and same resistance and found the Kestrel moved as much as 2 cm at the seat and more than one at the seat post insertion point. All other options had less than half that displacement. No doubt, the BB area may be plenty stiff, but the saddle moves under the rider significantly more than other options. We have visually confirmed similar movement with the Talon. Here's a video where we tried our best to break down frame flexibility and why it's important: https://www.youtube.com/watch?v=dKmsHtsD6qU It was actually the observation of a rider on a Kestrel that was the genesis of this project.
Trent Nix
Owned and operated Tri Shop
F.I.S.T. Advanced Certified Fitter | Retul Master Certified Fitter (back when those were things)