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So. I know a chunk about this, as I had a similar experience.
Yes it’s a moronic design, sticking a metal bump stop in the headtube that uses raw carbon of the headtube as the stop material is staggeringly stupid.
There’s no harm in asking Cannondale for a warranty replacement, but it probably won’t work as you crashed it. I have a SSEvo which developed a crack in the headtube from the same issue, only I didn’t even need to crash it, the design is that crap, just from usual handling, hanging it up, loading onto a car and mechanics handling in a bike shop was enough over time for the stop pin to crack the headtube. As I hadn’t crashed it, Cdale replaced the frame for free, my understanding is that they realised it’s a shit design and are easy going with replacements - if you haven’t killed it by crashing-. So sorry there. You can try the crash replacement policy but it’s pointless, it’s only like 15%off RRP.
Cannondale realised this is a crap design and made a running manufacturing change. SSEvo frames produced in the season after, MY2021+ have a metal insert in the headtube to counter the stop pin.
So this is where I ask the dad question, you using such an expensive frame- was it insured?
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