Well I tried to do a search but there were many many many threads on other boards about the physics behind this topic. One of the main topics that came up was a math formula defining the strenght of the tube based on the circ, depth etc...well this strength increase was there but insignifigant. It might look stronger but it really isn't. Whether or not it is good or bad, don't really care, I think it looks cool
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Ironhorse sgs pro has a 1.5 headtube.