I'm sure the tires are stock on this vehicle but I could be mistaken. Anywho, the sticker on the door says that the cold tire pressure should be 30psi for all tires. However when I went to inflate the tires properly, the actual tire states that the max pressure should be no more than 44psi.

I've been waiting to get back on here for some insight. Please help me with this quick situation.

-Alex

 

Keep them at 30psi cold.

 

Do not go by what the max pressure says on the side of the tires. Either keep the tire pressure at 30 psi cold as recommended on your door sticker or you can try them at 30 psi hot - which comes out to about 28 or so psi cold.

 

30 PSI cold works good for most conditions.

 

Recommend checking your tire pressures both cold and hot. I usually run my non-run flat tires at 32 psi cold and see them reach approx. 38 psi when hot on the road courses - no need to get close to the 44 psi max.

 

Thanks guys, just wanted to make sure! Don't want to ruin some perfectly good tires. I'm sure they are expensive .

 

If you have the stock Goodyear OEM Runflats (they will have EMT (Extended Mobility Tire) written on the sidewall), a lot of people run 28 psi in at least the rears for better tread life.

 

Just put on some Khomo UHP ASX non-craps. Still 30 cool?
Thanks.

 

I the two C5's I've owned, I've been running 31 psi in the fronts, and 29 psi in the rears.

 

The sticker on the door is GM telling you that after exhaustive tests they recommend 30 psi in the tires for the best combination of tread life, handling and ride comfort.
The markings on the tire are GOODYEAR telling you that after exhaustive scientific testing that if you put over 44 psi in this tire damage may occur.

 

I do what the cars manufacturer says, 30 lbs cold.

 

Simple as that.

 

the max pressure defines the maximum limit of air psi the tire can withstand. Anything over that limit can cause some big problems. It's kind of like a safety factor over the manufacturers recommended tire pressure.

 

I started a thread a couple of months ago asking this very same question. The overwhelming response at that time was to use the psi that was called out on the door sticker. Regardless of tire make or size. I'm running 30 psi all the way around on Goodyear GS-D3's. Hope this helps

 

As has been said so many times before - the MAX PRESSURE stated on the sidewall of the tire is exactly that - it is the maximum pressure that can be used safely in that particular tire. It is not the RECOMMENDED PRESSURE by any means.

If you really think about it - how does the tire manufacturer know for certain about what kind of car the tires will be installed on and how they will be used? The vehicle manufacturer is in a much better position to determine the best compromise for handling, ride, braking performance, fuel mileage and ride. And then - it is only a recommendation.

The person in the best position to determine optimal inflation pressure is the owner of the car. For me - 30psi is too much on my car considering where I live (Phoenix Arizona) In the summer time, 30psi cold will net me 36psi when the tires are hot. For me, I don't like the way the car rides or the way the tires wear at the hot inflation. So I chose to underinflate the tires to about 27psi in the summer, so that when the tires heat up - they get to about 31 or 32psi hot.

This time of the year, 27psi is too low, and I inflate them to 29psi and they get up around what I think is the sweet spot of about 31 or 32psi hot.

The bottom line is to keep a close eye on your tires and make adjustments accordingly all year. That's what the racing teams do - they adjust inflation according to their desired goals - whether that's tread life, certain handling characteristics, fuel mileage, etc. Paying close attention to the tires is the single best way to optimize tread life.

 

The General says 30psi cold, and that's my final answer!

 

Me too. This is exactly what I do, as the rears always ran higher "warm" temps than the fronts. I shoot for a warm temp pressure of 32 at all 4 corners and this is how it's accomplished on my 18/19 Supercar setup.

 

The sidewall by law must convey the maximum load capacity and the maximum pressure at which it can sustain that load.... That is what the 44 psi is...

It has nothing to do with the tire pressure the vehicle manufacturer recommends for proper handling of the vehicle.

 

What about cold-storing for 6 months up here in MN? Should I bump the PSI up a bit to avoid flat spots? If so, how much? Thanks

 

Some suggest adding air pressure during the winter months. Tires/wheels usually lose a little PSI with cold weather anyway, especially if you fail to perform routine maintenance on them.
Some suggest parking on carpet squares or the high density foam pads sold just for this "purpose".
The tires are steel belted and have come a long ways since the old bias belted tires which did flat spot when left in one position. Air them to 30 PSI and check them periodically during the winter and they'll be fine.
It's your car to do with as you please.