This is a quote from Lemond about the Zurich's and above.

"Thanks for your email. The Zurich is all 853, frame and stays. Where did you
read otherwise? We do use the 853, 525 combination on some of our much lower
priced Lemonds.

-------------------------------------
Steve Swenson
Trek Tech Support/ Warranty
steve_swenson@trekbike.com"

Hopefully this will end this argument. The Buenos Aires and below are 853 and 525 and the Zurich and above are 853 until you get into the TI bikes.