what does psi stand for in tire business
pound per square inch (psi) this is every square inch in your tire there is x amount of pounds of pressure whether it be 80-300 hope i helped. psi means pounds of pressure per square inch. For instance - if the tire calls for 30 psi - it means there is 30 pounds of pressure per square inch on the tire. Source(s): My husband is a mechanic countryhighrider Â· 9 years ago