Tire pressure question

Posted by CartRich On 2020/6/15 19:33:02

I have an idea what the answer is, but I will ask this question of those with more knowledge then me. I recently put new tires and tubes on a 37 and a 41 Packard. The tire walls say to inflate to 33 PSI but the owner's manuals say 22PSI and 28/32PSI respectively. What is the reason for the spec PSI being different from the sidewall PSI?