I'm confused on this whole theory. I have searched and can't find anything that answers my question. So here we go
Ok in my head this is what I think. A smaller diameter tube is a more compact sound structure. If you have a larger tube you have more surface area and thus allows the walls of the larger headtube to be ovalized/dented easier. If it is smaller it will hold up to internal pressure better than a larger tube, granted a larger tube will hold up to external pressure from bending better, but we are talking about internal from the steerer tube.
Kinda like a piston, a smaller piston holds more pressure than a larger one. (that's the best example I can come up with)
I mean I'm not saying a 1.5 headtube is bad or anything like that, all I mean is that I want to understand how it all works. So I can learn!!
Or is the 1.5 headtube not that much stronger ....but it allows fork builder to just put a larger steerer tube on their forks to somehow make forks a bit stiffer?
Thanks in advance guys!!