More justification of my working theory- It's try and see if it works for you. I'm 80% sure mine wouldn't stand up to that kind of work, but for you they do. It's examples like this, however that also makes me think I over-think stuff like is my bike capable of something. Another example that road bikes can be tougher than you think (granted this guy is obviously sub 200, but think about the physical forces he's putting on his bike compared to us who are just riding in straight paths and avoiding pot holes):