Tire Pressures.... what do you run?

[destrux]

I've been using a pyrometer to figure out my optimal pressures and they seem to be 30psi front and 28psi rear. This is with 255/40R17 tires.

What pressures is everyone else running? I'm just wondering how many others are running different pressure from the OE pressure sticker in the glovebox.

 

[airhead04]

I run 30 up front on a 245/18/40 and 32 in the back on a 275/18/40

 

[IJ.]

Lower the profile the closer to tire max to help save the rims from our less than perfect roads...

 

[MNBmk3T]

36 up front (225/50/16) and 32 in the rear (245/50/16) on stock sawblades with Toyo Proxes 4 rubber.

 

[destrux]

I noticed the car rides much smoother with the pressures down at 30 compared to when they were at 35 too. I have to run them at high speeds and check the temps again though. I was only able to test them on a road with a lot of turns at about 50 or 60 mph. On the freeway I don't know if they will build up too much heat or not.

 

[Grandavi]

I was gonna start a thread just like this. Normally I run 35 psi all around, but the tire shop puts em on at 32. Was wondering what the logic is. There is supposed to be a formula for this. You are supposed to weigh each corner of the car and the tire pressure is supposed to be set using the formula. I will see if I can find it. It's more critical on rv's then passenger cars.

 

[Orion ZyGarian]

I wrote up a bunch of words here, but seemed to have misplaced them. Errr...nevermind.

Shops make sure theyre between 32-35 for pretty much every car. Takes too much work to check each car and fill them individually...maybe 10% of techs out there do it right? More so in dealerships but still.

More tire pressure = stiffer ride, more gas mileage. Less tire pressure = more traction

 

[jetjock]

Contact patch and wear pattern.

 

[Orion ZyGarian]

Contact patch and wear pattern.

This too. I meant to mention that in my post. You'll need to watch your tires and how they wear (which you should do anyways). If they wear mostly in the middle part of the tread, theyre overinflated, and if it's on both sides but not the middle, theyre underinflated

 

[MPR]

I run 35 all around. They seem to be wearing evenly across the tread.

 

[te72]

I run ~35-36 up front, and 28-29 out back. Gives a nice balance of traction in the rear and and steering feel in front. 275/40/17 Nitto NT05's all around.

 

[destrux]

I wrote up a bunch of words here, but seemed to have misplaced them. Errr...nevermind.

Shops make sure theyre between 32-35 for pretty much every car. Takes too much work to check each car and fill them individually...maybe 10% of techs out there do it right? More so in dealerships but still.

More tire pressure = stiffer ride, more gas mileage. Less tire pressure = more traction

I'm one of those 10%... I check the pressure sticker on every car. On most luxury cars you can feel the difference between 30 and 35psi.

 

[Orion ZyGarian]

I'm one of those 10%... I check the pressure sticker on every car. On most luxury cars you can feel the difference between 30 and 35psi.

Nowadays you also have to reset the tire pressure sensor system anyways (standard on every car since 2007), so more people are going to have to, or risk getting comebacks

 

[radiod]

30psi all around is where I typically had it on 225/40/18 Nexxen N3000's.

Another thing that people don't typically think of is tire pressure will vary with cool and warm weather. If you have the same amount of air in 90 degree weather vs. 50 degree weather, you are going to have different tire pressures.

 

[Grandavi]

Someone clue me in... 30-32 psi (on a "normal" tire) would be good for 0-60 driving. For 60-100 mph wouldn't you want 35'ish? This is just "daily" driving, not track.
For some reason I think this is correct because there is more flex to cause heat at slower speeds.

 

[xzeror]

what do you guys recommend for 235/45/17 nitto 555 and 275/40/17 nitto 555r drag radial. Want to know whats a good pressure to daily drive and have the best traction possible, dont care too much about mpg.

 

[te72]

what do you guys recommend for 235/45/17 nitto 555 and 275/40/17 nitto 555r drag radial. Want to know whats a good pressure to daily drive and have the best traction possible, dont care too much about mpg.

I had these tires on my car when I bought it. Long as you don't mind a bit of sidewall wiggle, I would recommend no more than 30psi in the rear. 25-30 out back and 32-35 psi up front is what I would run on my car.

 

[doonsuka]

30psi all around is where I typically had it on 225/40/18 Nexxen N3000's.

Another thing that people don't typically think of is tire pressure will vary with cool and warm weather. If you have the same amount of air in 90 degree weather vs. 50 degree weather, you are going to have different tire pressures.

More so with larger tires. On my Excursion I'm running 39.5x14.5x 16.5, and not checking my tire pressure come summer time destroid the sidewalls on my tires. $2200 later I figured it out. My tires went from 60psi winter to 80 psi summer.

 

[Grandavi]

60 psi??? oh.. nm.. I just noticed "Excursion"... lol

 

[jetjock]

Tire cost is the least of his problems...