Allen asks whether we can go lower than 65 with the Endurance, to reduce bouncing on rough concrete highways. Good question! My fear is that by reducing tire pressure, we increase the chances of the tire overheating -- the lower pressure causes the sidewall to flex, and the internal friction heats the tire.
But how low is too low?? Is there an intermediate sweet spot? I would be interested to see if anyone has any authoritative data on that issue.
In the meantime, I run them at 65 and just put up with the bouncing.