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Tire pressures depend on what type and brand tire you are using, as stated above. I have Yokohama Avid's on my SPF. The Cobra shop suggested 20-22 lbs. Not nearly enough for my application. The tires were letting loose without prior notification, twice causing red flags to fly high. I went home, pumped them to 30 lbs. and have been happy ever since. Much more predictable and stiffer sidewalls equalling quicker steering response.