polodinks

i just got my 20 inch bullitts and the first time my tire pressure light came on saying fault cause of no tps in the new wheels..... at first i forgot about those and checked my air pressure and seen the fronts are in between 26-28psi hot and rears are 32 psi hot...... so my question is this what should it be at.....the tires are nitto nt555 extreme 255/35/20 and the only thing on the tire saying psi was 50 lbs max im not about to put that much...... what should it be at cold and is there any way to disable the tps warning

Deric

The only way to disable the TPS is to get some sensors installed. You can usually find a set on ebay for around $100. There's a tool for the F150 that allows you to reprogram the sensors for your car. Costs about $15 and takes about 10minutes to complete. I run around 35-40 psi in my 20's.

CW_06_GT

I have 265x35 20 Nitto 555's and I keep mine at 45psi

8905GT

Dang, why so much air pressure in the 20's? I keep mine at 32PSI, You guys know something I don't?

polodinks

i put 42lbs in mine and the wobble i thought was a blemished wheel is gone so its going great for me and it handles fine.... thanks guys

Robbieg

I run mine at 40PSI on all 4 corners.

06GT4RAD

I run 36PSI on all 4 of mine.

50PSI is way to much air in the tires, hell they are hard a rock as it is let alone putting them at 50PSI

Commbubba19

in modern radial tires the recommended air pressure required is based on load/weight. whether you are running 17's or 20's, the same manufacturer recommended pressure is fine +/- a few psi. i run mine around 34-35.

the value on the tire (ie 50psi) is the max pressure for any load the tire can hold.

Dineau

Hey polodinks can you elaborate more on how this fixed your wobble, I also have Nittos 555 and regardless where and how well I get them balanced they are wobbling at around 70 mph. I'm cureently running the, at 33 PSI so I'm starting to think I should go up to 40-42 lbs !

Give me more details on the symptoms you had at lower PSI.

Thanks,

8905GT

you guys with wobble issues have you checked to see if your rotors still have the retaining rings on the studs?

Glenn

running 42 on my front and 44 on the rear

Dineau

Of course I have checked for the clip, I've done it when I bought the wheels.

That's why I'm still looking at other possibilities.....

Thanks

polodinks

well it had a bad wobble before the wheels cause my rotors were warped and glazed....... thats what ford said when i brought it in...... they replaced everything and the wobble was not as bad but still there...... put more air and its so minimal thats its basically not there...... bump them up if you dont notice a difference then go back to lower pressure

8905GT

Good deal, just threw that out there since there is no reason to run your tires over 40 PSI. That is just going to cause wear issues.

Glenn

are you in the tire industry?

CW_06_GT

Higher PSI in your tires does 3 good things for you. 1. Harder side wall = less chance of damaging your wheels on that unforeseen pot hole when you have a 35 or shorter side wall. 2. Reduces friction which = better MPG. and 3. Reduced friction also = better tire wear. Hence the reason why I run mine at 40 PSI all the way around.

8905GT

interesting, does anyonre really know what the tire pressure should be?

"Disadvantages of Overinflation
An overinflated tire is stiff and unyielding and the size of its footprint in contact with the road is reduced. If a vehicle's tires are overinflated by 6 psi, they could be damaged more easily when encountering potholes or debris in the road, as well as experience irregular tread wear. Higher inflated tires cannot isolate road irregularities as well causing the vehicle to ride harsher and transmit more noise into its interior. However, higher inflation pressures reduce rolling resistance slightly and typically provide a slight improvement in steering response and cornering stability. This is why participants who use street tires in autocrosses, track events and road races run higher than normal inflation pressures."

Stoenr

40-45 is going to be required on the rubber band of a tire to have the OE load capacity as the original tire. Smaller sidewall cannot support the weight at the stock 30-35 psi. Hey its your wheels, and tires that are going to suffer, not mine.

8905GT

So 40 to 45psi is correct?
If so, I have no problem admiting I am worng because I want what is best for my car.
for 245-35-20 what would be the correct pressure?

Stoenr

That is correct.