psi is preference at what people have learned works for them, motorbikes cars or big trucks, a dealer want set a tire to max psi in most cases, big trucks it’s a must to run max on tire not door jamb because more than likely you are at max cold Load stamped on tire, so motorcycles some of us run different air settings, it is critical though if you approach max cold weight air to go with what tire says cold. I base this on information from my neighbor who worked for Bridgestone tires for 30 years, Curtis low we called him, a very cool old man, who only spoke what he knew to be right. The science behind this is for every pound of air you are shy of the max cold psi at the max weight both criteria must be met, the air temp in that tires rises 10 degrees f . I personally run max psi cold cause I am approaching weight limits front and rear, no fat jokes please I’m sensitive