Most people way over inflate their tires, I like the numbers from this tire pressure calculator a lot. For me at 165 pounds it suggests 60 psi in a 28mm tire for rough surfaces, thaty seems crazy low, but it turns the bike into a hover craft on the coarsely chip sealed roads of Death Valley while not being soft enough to get corner squirm.

https://www.renehersecycles.com/tire...ftLdwvYtNxiczs