If you have standard passenger tires (ninety percent of vehicles do) the lowest tire pressure you can generally drive with is 20 pounds per square inch (PSI). Anything under 20 PSI is considered a flat tire, and puts you at risk for a potentially devastating blowout.

between 30 and 35 PSI

Normal tire pressure is usually between 32~40 psi(pounds per square inch) when they are cold. So make sure you check your tire pressure after a long stay and usually, you can do it in the early morning.

Higher pressure generally is not dangerous, as long as you stay well below the “maximum inflation pressure.” That number is listed on each sidewall, and is much higher than your “recommended tire pressure” of 33 psi, Gary. So, in your case, I’d recommend that you put 35 or 36 psi in the tires and just leave it there.

You can run the tires up to about 40-42 psi on tires of that size. Over 50 psi is way too high..

Too Much Pressure or Over Inflation An over inflated tire is stiff and the ride will be rough. They don’t give in much to bad road conditions and the size of its footprint in contact with the road is less than what the tire manufacturer intended when they designed the tire.

Most tire-pressure monitoring systems warn you when your tire pressure drops by about 10 percent. For you, 10 percent would be a little less than 30 psi. Low tire pressure always is more dangerous than high tire pressure. So, in your case, I’d recommend that you put 35 or 36 psi in the tires and just leave it there.

It is not advisable to inflate the tires of your car to its maximum psi. The maximum pressure of tire is usually stated on its sidewall. You will have to inflate them to the pressure that is specified by the manufacturer of your vehicle.

51 Max PSI is the maximum pressure the tire can handle. Normally you have a sticker on the door frame that tells you the recommended tire pressures from the manufacturers. The tire pressure posted is for giving best ride consideration and normal load conditions.

According to Berger the maximum inflation pressure for modern tires is typically between 44 and 51 PSI (pounds per square inch). If a driver inadvertently puts too much air in a tire it won’t necessarily cause any damage, but it will impact other aspects of the vehicle.

“Maximum” is just that… the maximum pressure that the tire is rated to handle. The pressure listed by the car is a number determined by things like the car’s weight (and so on) which varies from car to car. A different car might need a different pressure but the tire wants to make sure that you don’t exceed 51 psi.

To find the correct PSI for your tires, you can either look inside your car door or open your car’s manual and look it up; you can usually find it under “tire maintenance”. Most cars and trucks will fall between 27 and 35 PSI, unless you’re using a commercial vehicle, because the PSI for those tires varies widely.

Tyre pressures are normally higher in the front than the rear, to compensate for the extra weight of the engine and transmission, especially on front-wheel-drive cars. If you have a full complement of passengers and luggage, car makers often recommend pumping up the rear tyres to compensate.

Most passenger vehicles recommend 33 to 35 psi. At 28 psi, you’re running a little low and really should get them aired back up. That’s not what I would call alarmingly low, but anything more than three or four pounds below normal can cause handling problems and increases the potential for a blow-out.