Old 02-06-19, 11:13 AM
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Being that many of the carbon bike top tubes are thinned for aero effect, it does not seem unreasonable that you could sit on top tube and crack it. Or from flexing over time by sitting on it. Certain areas are made stronger, others lighter or aero. Also depends on the quality of the bike.

I realize its now popular to sit on the frame going down hill, but those guys have the vast majority of the weight on the pedals and their bikes are free. But maybe that will become a point on future bikes if there are issues that are not necessarily made public.
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