This has been discussed at great lengths, but like oil, everyone has 3 opinions. I like to run them harder, over 40 lbs. Improves handling and tires wear more evenly. Of course I have a 29 so not completely applicable to your situation. You can see in my avatar there isn't the typical tire squish.
Thanks guys. My tires did not look too low but I was surprised they were only aired up to about 15 psi ! Just not that obvious when they are low. Checked and confirmed max pressure was not posted on the side walls.
Most of the time, that number is Max pressure, and it should indicate if that is the case. Max is what the tire can handle, and shouldn’t be assumed to be correct for the vehicle it is currently attached to.
I always verify with the factory tag on the vehicle or the owners manual for proper tire pressure.