ON the 17x8 wheels with stock sized 245's? mine worn very uneven with the pressure ford says to use. I am about to replace them and get an alignment so i dont want to ruin them.

 

I run 38 psi on my pirellis.

 

30-32 psi

 

on 35psi-max I run 32, on 44 max I run 40, on 52 max I run 40. There's no reason to underinflate performance tires for street use. Drop the pressures in half for drag time.

 

32 PSI in mine.

 

32psi and yes its normal for the middle to get bald way before the outside edges. What you get when you have a v8 with RWD haha.

 

lol, and for those of us with the sixxers they're a b*tch to rotate! i mean ya got one tire that's almost bald and 3 that are all good.



to hell with the one tire fire!

 

30

 

not running stock sizes...but 36-38 rear and 32-34 front.

 

I had a similar problem with my 04 GT. The inside of the front tires were worn out bad and unevenly. When I took it to get aligned,they said it was due to low tire pressure. I was running the 30lbs Ford suggested.Had it re-aligned and put 44lbs in a 50lb tire and no more problems!

 

bone stock 40-43 psi........i duno y. just a european habit i guess

 

+1

 

30-32 also

 

40 HERE

 

35.5psi for all four corners for me. Usually start at 41.5psi for autoX.

 

36 psi all around. I have 275's on all 4 corners on cobra rims.

 

Here's a method I've been using for several years now on new tires that works great. The chalk method.

With a cold vehicle and cold tires, air them up way over pressure. 40 psi should be OK. Take a chalk and mark a chalk line sideways across the tread of a front and rear tire. Drive your vehicle several yards (30-60 or so should do it). Now look at the chalk marks.

You should see the inside of the chalk marks worn off of the tread but the outsides should still be showing. In other words, the bowed out overinflated tire was wearing the middle of the tread and not touching the outside of the tread.

Release a couple of pounds of pressure from the tires and repeat the experiment. Continue until the complete chalk marks wear evenly. (You might want to lose another pound to make sure the entire tire is bearing down across the tread once the entire chalk mark disappears at the same time). You have now determined the tire pressure at which you are keeping the entire tread on the road.

Under this pressure you are wasting available fuel economy, generating excess heat, and prematurely wearing the tread. Over this pressure you will get better mileage at the cost of comfort and decreased tread life. Keeping at this pressure will wear the tire evenly and thus extend its life to its greatest extent and offer the best compromise possible between gas mileage, comfort, and safety (you'll have your whole tread on the road). The pressures may be a couple of pounds different between front and back for your particular vehicle application.

 

that is interesting. well said gimpster. makes sense to me, its worth a try

 

I just brought new tires. I will give this method a try and let you know how i do.
Thanks