MR305

i'm so sorry Sr.157db if you wasted your time reading my reply but it was not meant for you to read it, it was for enzo51 then one with the question:

which you answered very clearly in your reply.. again very sorry...

Norm Peterson

I only see the wheel size. Proper tire pressure also depends a bit on the exact tire size.

If your 17's have the OE 235/55-17 size fitted, then you need to use 32 psi as per the factory recommended pressure for that size tire. Start from there, anyway, as you might find that other pressure(s) suit your driving a little better.

Since your car came with 16's, your door sticker probably says 35 psi. That pressure applies to the 215/65-16. You can probably run 235/55-17 front tires at that pressure without any worries, but I don't think you want that much in the rear tires (they'll tend to 'hop' more going around bumpy corners).


Norm

rls82959

I'm running 36psi Nitrogen.
Haven't had to add any in 16 months.
Door jam says 32.
Have a great day.

.boB

Proper pressure depends on a number of facters - weight, tire design, tire size, temperature, road surface, use, etc. You want whatever pressure will place a flat contact patch on the road.

There are two easy ways to set proper pressure for the average guy/gal. First - and best - is a tire pyrometer. Drive down the highway that's fairly straight for a while, then pull over and check temps. You want a nice even temp across the whole tread surface. Hotter in middle means overinflation; colder in the middle is underinflated. You can also use a laser infrared thermometer. Not quite as accurate, but would work for this kind of thing.

IF you don't have a pyrometer or a thermometer, you can use standard blackboard chalk. As before, drive down a fairly straight highway and get the tires to operating temp. Pull over, and use the chalk to make a solid chalk like across the entire tread width. Drive foreward about 1-2 car lengths. Look at the wear on the chalk line. More in the middle means overinflated.

I used a probe type tire pyrometer. 32psi is perfect.

mustangman02232

i run 40 psi front and 34 psi rear in my 17" bullits