Best tire pressure

[PC 2015]

Best tire pressure for the streets. Nitto 555r's...20x305 35

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[GOTdaBLACK1]

32 psi

 

[PC 2015]

32 psi

Thanks

 

[GT Pony]

Good thing it wasn't asking for "best pier pressure" ...

https://i.chzbgr.com/full/2334898944/h26D7C1D9/

 

[PC 2015]

Good thing it wasn't asking for "best pier pressure" ...

https://i.chzbgr.com/full/2334898944/h26D7C1D9/

Lol auto correct

 

[66Bronc1]

I always monitor my tire wear- view the tires every two weeks or so- and especially when I rotate them to make sure the pressure I am running is wearing them evenly. Most people under inflate and you can see the edges wearing more than the center. Tire pressure depends on the tires, wheels, vehicle weight, etc.

My GT has the stock 19" wheels and tires- so far the best pressures for me are 37/35. It seems to be even wear but I am still analyzing after 5K miles

For example only, my 1997 Jeep Wrangler has after market 31 X 10.50-15 wheels and tires. The previous owners ran 35-40 PSI- way too high for a light weight vehicle and a large foot print tire. I could see the tires wearing much more in the middle- from over inflation. I reduced the pressure to 29-30 PSI and seems to be fine now.

 

[PC 2015]

I always monitor my tire wear- view the tires every two weeks or so- and especially when I rotate them to make sure the pressure I am running is wearing them evenly. Most people under inflate and you can see the edges wearing more than the center. Tire pressure depends on the tires, wheels, vehicle weight, etc.

My GT has the stock 19" wheels and tires- so far the best pressures for me are 37/35. It seems to be even wear but I am still analyzing after 5K miles

For example only, my 1997 Jeep Wrangler has after market 31 X 10.50-15 wheels and tires. The previous owners ran 35-40 PSI- way too high for a light weight vehicle and a large foot print tire. I could see the tires wearing much more in the middle- from over inflation. I reduced the pressure to 29-30 PSI and seems to be fine now.

Thanks. I'm just trying to find out best pressure for street traction on DR/555r's

 

[Ebm]

I always monitor my tire wear- view the tires every two weeks or so- and especially when I rotate them to make sure the pressure I am running is wearing them evenly. Most people under inflate and you can see the edges wearing more than the center. Tire pressure depends on the tires, wheels, vehicle weight, etc.

My GT has the stock 19" wheels and tires- so far the best pressures for me are 37/35. It seems to be even wear but I am still analyzing after 5K miles

For example only, my 1997 Jeep Wrangler has after market 31 X 10.50-15 wheels and tires. The previous owners ran 35-40 PSI- way too high for a light weight vehicle and a large foot print tire. I could see the tires wearing much more in the middle- from over inflation. I reduced the pressure to 29-30 PSI and seems to be fine now.

Sounds like they never took the Jeep off-road lol. My XJ has 33x12.50-15 and runs around 32-33 psi on the street. The Mustang has 275-35-20 and runs anywhere between 31-34 psi.

There's a sweet spot for a tire where it absorbs bumps and rides well while wearing evenly. I'd say most people run 30-35 psi.

 

[Bluemustang]

There is no best. But I recommend running a little lower pressure to take advantage of the wider tires. 29-30 psI.

 

[Zinc03svt]

31 psi on the Michelin PS4’s.

 

[Ronin5.0]

35 winter, 32 summer. I have Michelin...

 

[frank s]

Correct. If your drag racing is serious enough to be concerned with thousandths of a second, you might consider inflating the fronts to the maximum pressure as molded into the tire. Less rolling resistance, they say.

But OP is talking Strret. Follow the door-jamb sticker.

I always inflate to 33 or 34 psi whenever checking or adjusting pressures. Thirty-two usually changes to 35 or 36 in normal use (according to the dash guage display) and 33-34 yields the same. In any case, the extra pound or two makes for easier adjustmentk to 32, if the mood strikes.

 

[Cobra Jet]

Also always test your tire pressure “cold” (prior to driving). That is always your baseline and if needing to fill, do as others have said, use the door jamb sticker (on any vehicle) to know what psi to fill the tire. As others have also stated, tire psi will increase as the tires get heated, so don’t be expecting to see “32” on the dash readout for each tire as you’re driving. The “32” should show as the initial reading and will gradually increase.

Testing tire temps cold in different seasons will also result in varying readings. So if you’re in an area that has the (4) Seasons, always check tire psi monthly - as the psi will not remain stable as the seasons change.

The side wall tire psi from the tire manufactures is their recommended min/max setting - but the vehicle manufacturer recommends a set pressure due to vehicle weight (people/packages) and total load distribution for best performance of the tire, such as sidewall flex and overall load bearing on that tire.

Higher (or lower) tire pressures (on street) will affect not only gas mileage results, but also longevity of the tires due to wear/tear based on vehicle load distribution.

 

[ssowin]

I have a 2015 Mustang GT with a staggered setup, and Continental Extreme Contact Sport tires. This is what Continental tells me the psi should be...


Based off what was provided to me, yes they’re correct. Here’s the explanation as to why they’re correct.

Your OE tire size was, 265/35ZR20 XL 99Y at 32 psi. I drew this information from the “Tire Guide.” The Tire Guide provides the OE data for each tire fitment on every auto manufacture. To ensure the information regarding your OE fitment is correct, please look at your door placard.

Your replacement sizes are, 285/35ZR20 SL 100Y and 315/35ZR20 XL 110Y.

So your OE tires have a load/speed index of 99Y. Your replacement tires have a load index of 100Y & 110Y. Meaning the replacement tires can hold more weight while using lower pressures, but also sustaining the same speed rating as your OE tires.

Your OE tires could hold 1373 lbs. @ 32 psi. per tire. On your front axle, the 285/35ZR20 SL 100Y tires can hold 1393 lbs. @ 27 psi. per tire. So from a constructional standpoint, it takes less pressure to withstand the same or more weight. On your rear axle, the 315/35ZR20 XL 110Y can hold 1391 lbs. @ 22 psi. per tire.

Please understand, these are calculations based off data from the “The Tire and Rim Association Year Book,” and the “Tire Guide.” Each of which are the governing bodies, as it’s related to OE fitments, tires, rims, loads, and air pressure. Please understand, these pressures are recommendations. You’re going to run what pressures you’re comfortable with, the pressures I provided are strictly derived from the numbers.

Best Regards,

Brian Sheridan
Technical Product Service Engineering

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