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Actually tire size does mater, most people think the bigger the tire the more PSI needed but its the opposite. When I put bigger tires on my Jeep years ago 31x10.5/15 the guy at the tire store said Ill pump these up to 50 PSI because bigger tires need more air. The ride was horrible. I did some reading and found out that larger tires need less PSI and those tires actually worked best with 28 PSI.