Originally Posted by
Spoonrobot
Or maybe;
4) None of the bicycles has frame flex characteristics optimized for the rider(s).
And there's this:
Yeah, I was referring to that earlier in the thread, and it was why I was wondering if Trek's isospeed coupler might be used in the same way. I think this would really be helpful in trying to pin down what to measure. If you could turn it on and off and measure differences, it would be extremely helpful in experimental design.