Finally was able to take pics of my new wheels and tires. But, I am wondering what the recommended tire pressure for these 255/45-18 tires should be. The guys that mounted & balanced them set them to 45psi. Should they be at 32psi like the 235/55-17's?

Here is a new pic:
[attachmentid=35134]

 

Does it not say the reccommended pressure on the sidewall?

 

It says 50psi Max pressure. I think I'm going to set them to 32psi like it says on the sticker inside the door.

 

I run around 30-32 psi on my bmw with that tire size in the rear and I get wear that is fairly even with the center wearing out first; probably caused by the fact that my foot is to the floor most of the time. I have thinner tires up front and run about 38 psi in those.

Just my 2 cents worth.

Jon

 

How is the ride with the F1's? Any different than stock? Could you please post some close-up pics from the rear and front? I'd like to see how wide they look. Thanks

 

Do you have anymore pics of the 18s. Are those polished or chrome? They look real nice. Your car looks awesome. One more question. How much did those tires cost ya?

 

Thanks, Carlos. I have more pics at home. They are the anthracite, they look brighter on camera, though. The tires were about $812 including shipping from tirerack.com. They also came with a $75 gas card from goodyear. I'm still waiting on that to show up.

Mike, the ride is just a little bit rougher, but that's to be expected with the lower sidewall. I don't even notice it now. They sure do stick better that the stock tires. I'm just waiting for it to rain to test out the claims goodyear makes about the wet performance. When I get home I'll post some closeups. I put a few new pics in my gallery last night. There's one of the front that shows how wide they are.

 

If the max is 50 you should set them a few psi below that. Most tires that are set to 32 have a max psi of 35.

 

I am trying to figure out how this tire/wheel combo would look like on a car not lowered? Would they look ok?

 

Here's the other pics I had:
[attachmentid=35239][attachmentid=35240][attachmentid=35241][attachmentid=35242][attachmentid=35243][attachmentid=35244][attachmentid=35245]

Hey John, I thought of that also, but on the stock Pirelli's it says 51psi max pressure. On tirerack.com they say whatever size tire you use, just set it at the manufacturer's pressure.

 

I don't think your tires should be at 46 psi

 

[attachmentid=35280]Bought some BFgoodrich g-force KDW-2s for my stang and the max pressure read 50....I set them at 40. Got 18X9 front and 19x10 on the back. You usually want to set tire pressure 5 to 7 psi below max. Pics

 

 

They sent 1/4" spacers for the fronts to clear the calipers. The rears were ok. The spacers they sent don't exactly look like the best ones out there, but they do the job. Also, don't forget to remove the factory retaining clips that hold the rotors on. The spacers will not clear them.

 

Wheels and tires look great. For 255's the tires look pretty wide. Any increase in road noise?

 

You have 19x10's in the rear or did you mean 18x10? Car looks nice btw. Where did you get your set of wheels from?

 

Thanks, I'm thinking about getting a 1/8" spacer for the left rear to even out where the rear axle is off. I havn't noticed any increase in road noise. These tires are pretty quiet for their size.

 

It's been said here, but in case you aren't fully clear, set them to what Ford recommends. If it's 32 lbs then that's all the car needs to stay up regardless of tire type, except for the spare of course.
The V6 requires 35lbs, so I'm assuming the GT only needs 32 right?
Keep them at that PSI at cold. Ford engineers recommends a specified PSI for a reason. Obviously its more harm to have them low than high.

 

[attachmentid=35421]Sorry .. 18x9 front, 18x10 back. Got them at Mustangtuning.com

 

Oh man, so much misinfomation in this thread.

First of all, the MAX PSI listed on the tire, is just that, MAX. It has nothing to do where the pressure of your vehicle should be set at.

Secondly, manufacturers usually set the factory PSI to optimize tire wear, handling, and treadlife.

The easiest way to find the ideal PSI for YOUR car is to do a simple chalk test. It's easy to do.

1 - Find a nice flat, open parking lot.
2 - Draw a line across the tread of the tire (from drivers side to pass. side, or vice versa)
3 - Drive a tire revolutions and view chalk line.
4 - If the chalk is worn off the edges and still bold in the center, the tire is underinflated. if the chalk is worn in the middle, but not on the outside, it's overinflated. If it's worn even, it should be good to go.

Also, remember tires can inflate about 2-4 PSI when warm.
You can add more air after the chalk test to increase your MPG a little. It may be of no effect. It should in theory also wear the center of your tread a little quicker as well.