Northwest GT

I've had the GT500 takeoff wheels and tires on the car for a week or two and they feel fine. Just want to check the recommended pressures. My car is a 'vert if they are different than the coupe. What's on the door sticker of a GT500? Thanks.

07S197

Yeah I have them as well and have always been curious what was on a sticker. However I have a coupe.

Thanks in advance.

Supercharger

GT500 sticker tire pressure for my 2009 coupe is 35/35. Don't know about the vert.

07S197

Thanks!

Northwest GT

Same pressures?

Northwest GT

Maybe 35 all around is OK.

Northwest GT

Thanks

eci

Recommended pressures are for the vehicle based on its weight, not the tire. Inflate to the pressure specified for YOUR car. The GT500 is heavier hence higher pressure recommendations than a GT. Tires have a maximum pressure of course, usually 44 PSI for car tires. For example a GT500 coupe is 35 while a GT coupe is 32. If you put GT500 wheels and tires on a GT, 32 is what you should inflate to.

2k7gtcs

The auto manufacturer puts that label on the door based on the weight and not what tire you may end up using. They have no idea what tires will go on the car in the future, but they know what the car weighs and the tire pressure should be based upon their recommendation.

Supercharger

True that the GT500 is somewhat heavier but I think a combination of factors go into the pressure recommendation, including the type of tires. If the recommendation merely reflected weight, then all the Mustangs (which are front heavy) would have higher recommended front tire pressures. Tires and wheels for GT500 are different than for the GT. If I remember correctly (I traded in my GT for the GT500), the GT tires have more sidewall. If it was me, I would inflate the GT500 tires on a GT to 35 or no less than 34.

bob

32 PSI should be suffcient, the contact patch doesn't really change with the same diameter tire (crazy stuff, but check it out some time) but changing the pressure will change the contact patch and as long as the new larger tires can support the weight load of the GT at 32 psi then there is no need to alter the factory reccomendation beyond the need for tuning the car to your personal wants.

Northwest GT

No text

Kevindust

The recommended tire pressure listed on the door sticker is essentialy useless. Optimum pressure is dependant on your tires, your wheels, your car, your alignment, your climate, your driving style and your traction goals...etc. These variables can easily offer a +/-range of 10psi...and that is just on the street.

You want better mileage? Run 42 all the way around...but expect the car to slide. Car oversteers too much? Take psi out of the rear.

Way too many variables here. It's best to set a baseline and pick your goals and a favorite road...then experiment in small increments until you find your happy place. Need help? Talk to someone in your area that does solo II. Better yet, try some solo II fun runs for yourself.

As a point of interest (to those that may care) the tire pressures we run in the Escort stock car are approx RF 37, RR 33, LF 33, LR 24

bob

Heh, I'd love to meet the person who'd run 22 psi on a daily driven S-197. I'm sure it works, but by the same token I bet they would get tired of having to adjust the air pressure any time they wanted to do something other than drive the car from point A to B by themselves with only a full load of fuel in nice weather.

IMO, instead of essentially useless, I'd say the door sticker is the best compromise for most activities under a variety of driving styles.

anthony05gt

Look in your door jam and run what your car has on the sticker. That's where it should be.

Kevindust, you sound like you speak from a road racer's standpoint. I doubt that line of thinking applies here.

69Mach1-409

I run 34-35 all around and I have 15k on the OEM GT500 wheel / tire package. No abnormal wear and they still have plenty of tread left.

eci

Agree.

Bigjht

I think Kevindust hit the nail on the head. The door sticker is a good place to start but is not the magic answer. Every tire is different and everyone's driving style is different and the proper tire pressures will be different to accommodate for those. Even the type of roads you drive on everyday, i.e. curvy or mostly straight, etc, can require different pressures to maximize tire wear and performance.

anthony05gt

You don't make any sense. You say the door sticker is a good place to start, Kevindust said it's essentially useless. Hit the nail on the head? Kevindust is right when it comes to hardcore corner carving or competitive type of driving, but for the average Joe that wants to get some miles out of their meats that's not particularly a good idea which is why the door sticker exists.

Bigjht

He hit the nail on the head about experimenting in increments until you find a happy place, depending on your driving styles and the roads you drive on. Plus, what he is saying is not just valid for corner carving in competition but for public roads as well and for the average Joe, which I am. From my own experience, I used the PSI on the door sticker and the wear on the edges of the tires were more than on the center causing the tires to wear too fast. I rotated those to the rear and increased the ones now on the front up to 40 PSI and the tires wear evenly. I'm not corner carving in competition and am usually in too much traffic to push the tires to the limit, but I do usually drive on curvy roads. If I would've stayed with the sticker PSI I wouldn't have gotten as many miles out of my tires so it was "particularly a good idea" for me. I've also had similar experience with having to use different PSI when changing to a different brand of tire on the same car to ensure even tire wear. Again, this will all be dependent on the individual and the type of roads the car is driven on. To many the sticker PSI will work just fine, but it's not the magic answer. The best practice for anyone would be to check tires often and adjust the PSI as needed in either direction.