Don't want to be Mr Doom here but there's no way I'd ride that with an unbraced head tube like that. That's just asking to snap.
I rode the frame in several Ardennes gran fondos, which included cobble stone sections. I also rode it in several crits. So I think it is safe to say the frame is plenty strong.
@jj72 started
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Don't want to be Mr Doom here but there's no way I'd ride that with an unbraced head tube like that. That's just asking to snap.