Originally Posted by
WhyFi
I can't answer your question, but curious as to why you're asking. Are you waiting for rear IsoSpeed like in the new Madone? That's not something that would make me wait and I can't really think of anything else that would.
the iso speed tech started with the Domane. The reason the Madone iso speed is on the top tube is to allow the same level of compliance across all sizes of frames, according to Trek. I guess the range of compliance is less on the smaller frames with the iso speed on the seat tube.