Originally Posted by
cxwrench
Back when I worked for Kodak/Sierra Nevada the Healthnet guys rode Giant TCX frames. Some of the guys definitely complained about their frames losing stiffness over the season. A guy I know that worked for Schwinn (I think) at the time took a new frame and an old frame to a facility that they had in CO and checked the frames on a rig they used. As the story goes the old frame was around 20% more flexible in certain areas compared to the new frame. These days I'd say that's not possible unless some major mistakes are made.
My 2014 Synapse Carbon has over 16K miles on it and feels just as stiff as it did when it was new.
My 2007 Trek Pilot 5.0 with only 6K miles on the other hand feels like a noodle.