An interesting conundrum this. And I agree with alot of things said by everyone. At first I was willing to agree with this being a flaw with the bike and canyon etc etc, but the more I thought about it, the way I ride, the way people "should" be riding then my opinion started to change. For starters. I think if you are sitting on the TT when doing an aero tuck you are doing it wrong. It's a quick way to make yourself sterile in the event you hit anything thicker than a 10c coin at 80kph. I think it's common knowledge that the TT is one of the thinnest tubes in a bike frame. I've been riding for 12 years now. Racing elite a year now. And when I aero tuck I don't put any weight on the tube. I just sit low enough that I can feel the tube and then hover a little higher that. But weight that's a no-no in any event. But I think the others in the SA elite scene will concure with that as well. Aerotuck = down low close to TT but no weight. And technically speaking aero tucking isn't therefore technically illegal as you aren't using the TT as a contact point. And I don't think it should be banned either. Why should a position be banned? Yes it might be risky but if you have good enough skill to pull it off use it to your advantage but at your own peril? I've had to use the Aerotuck a few times in the descents. Spesh and the Wintunnel did a test where the tuck can get you nearly 10kph of free speed in the descent once you've spun out. There are times when that little extra is needed. Back on the actual topic though. I don't think there is anything wrong with the bike. If you are putting some or most or all of your 86kg heft on the TT doing the now aptly named "destructotuk", it's a big ask for pretty much any tube on the bike. I don't think it has anything to do with the bikes quality or the way its built. Maybe Canyons quality should be questioned maybe it shouldn't. But I think if you hit a bump hard enough that the frame, at that point, gets exposed to 86kg of force or more and breaks I don't think it's the frames fault. Now I get what you are trying to attempt to say by trying to make it seem that you are a skilled rider and all that "cat1" and all that? I assume that's A batch? No offense to any A batch or lower riders here on the Hub. But having come from A batch, it isn't all that fast and or skilled for that fact. And it sounds like you kind of wanted to prove a point to the guys at Canyon but ended up doing the opposite. Because a knowledgeable rider (don't read as good or skilled but rather as those with bike knowledge) will know that sitting on the TT is not good. It's a thinly built tube and one of the thinnest on a bike. And by making this high story of being skilled and cat1 and then concluded with sitting on TT with weight on it, you just made yourself look like an arse to the guys at Canyon. If you don't have the core strength to hover while aero tucking, You shouldn't be doing it. Because you will be putting yourself and other cyclists around you in unnecessary danger. Because either the bike will fail as you have seen. Or because your bike control is actually compromised vs "hovering" over the TT and you can easily wobble and loose control of the bike. Edit: Something I left out. But on the other hand. Frames do get exposed to forces outside of their design spec all the time. Often when waiting at races I sit perpendicular to the bike and lean back against the top tube. I also do the whole "sitting on the top tube while straddling the bike" while waiting for the races to start. My Fuji Transonic hasn't cracked yet and neither have any of my other carbon bikes when I have done this to them. But then again they are probably only betting exposed to maybe 60% of my 65kg weight. It's difficult to say whether the Canyon would of cracked or not of exposed to similar loads. And if they do. Then it's probably another can of worms entirely.
