Respectfully, you’re way off track in your analogy of my circumstance. They’re 26” x 2.0 street tires inflated to 70 and 74 PSI (front & rear), so they don’t experience pinch flats. I always run higher pressures.

Pedaling out of the saddle provides greater torque to the rear tire, making them more prone to driving debris into the rear tire (the front tire almost never goes flat). They’ve been pinhole flats from tiny pieces of metal which can’t be spotted when riding (i.e., just the needle portion of a small thumbtack and a fine piece of wire like that from a radial tire, both of which just barely penetrated the inside of the tire). They permitted me to ride several miles before I had to repair the tire, but as the air pressure dropped, the rear tire became “bouncy” and its rolling resistance became objectionable.

When the rear tire is inflated to 74 PSI (these 26” x 2.0 street tires are rated 60 to 80 PSI), my 32.6 pound Giant Rincon is a fast moving mountain bike, but by the time the pressure drops to 50 PSI, it begins to feel like a brake is dragging. If I can feel the slightest bounce in the rear tire, its air pressure is too low. Even though squeezing the tire with my fingers with 50 PSI gives the impression of a highly pressurized tire, it’s still too low to provide pleasing rolling efficiency.

My friend always thought 50 PSI was a good air pressure, but when I told him to inflate the tires to 70 PSI front and 74 PSI rear (I bought him the same set of tires because I knew he’d love them), he noticed how much easier it was to roll along at higher speeds. When he tried going back to 50 PSI, he was surprised by how much more effort was required to cruise at the same speeds. At their large volume, they still provide a satisfactory ride even at the higher tire pressures.