According to my system at work it says 35 front and 33 rear for that size. ( Which just so happens to be the tire size and pressures I run. )

LxiMax said:

According to my system at work it says 35 front and 33 rear for that size. ( Which just so happens to be the tire size and pressures I run. )

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Do you notice a change to your gas? im running 32psi in the front and 30 in the rear

Higher psi in the tires will yield better mpg ,BUT at the cost of faster tire wear and a slightly more bumpy ride.

Lower psi (stock levels) comfy ride , even tire wear, but average MPG

ChiTownHussla said:

Higher psi in the tires will yield better mpg ,BUT at the cost of faster tire wear and a slightly more bumpy ride.

Lower psi (stock levels) comfy ride , even tire wear, but average MPG

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So should i stick with the 32 front 30 rear or do the 35front and 33 rear?

Personally since you just bought all new tires and stuff, I would stick with oem. On my Honda's I run 45 psi all day no issues, but I want best MPG from them and run used tires.

Run the OEM recommended pressure on your door badge. Your spine and your tires will thank you

Spoolin92GSX said:

Run the OEM recommended pressure on your door badge. Your spine and your tires will thank you

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Alright ill try it.but will it matter that i have 17" instead of my stock 16"?

Deadpool99 said:

Alright ill try it.but will it matter that i have 17" instead of my stock 16"?

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If they are an aftermarket performance style tire than i would run them higher than what is recommended on the sticker. I would run around 40-44 in those.

I've run different pressures in every type of tire I've run on my car.

Autox:
- as high as 54 psi (hot) and as low as 40 psi (cold) in my Star Specs (245/40/17)
- as low as 32 psi (cold) in some beat r-comps I got for free (255/40/17)

Street:
- 36 psi in ContiExtremeContacts (215/50/17)
- 40 psi in the Star Specs (245/40/17)
- 42 psi in my Hankook V12 K110's (255/40/17)

Winter:
- 32 psi ContiExtremeContacts (215/50/17)
- 34 psi studded General Altimax Arctics (205/60/16)


How did I come to those numbers? Mostly through trial and error. I keep an eye on tire wear and tire temps (autox).

44 psi on the street sounds pretty high.
I'm sure the tire is an important factor but there's no need to put my back through something like that on a daily basis.

Door badge should say 32psi front and 29 rear.

Also remember that the door pressure size is for stock size tires ( 215/50/17, 205/55/16, etc... ). Thus why I said 35 front and 33 rear is recommended for 225/45/17. In my case the car rides great, handles well, and takes bumps with ease.

Try the 35 and 33 and keep an eye on them. If the centers start wearing faster than the outside drop the pressure a bit. Same can be said for under inflation, if the outside is wearing more than the center you can add some pressure. (Edgewear can also vary depending on your cars alignment and your driving style) but worn centers is a aboslute sign of too much pressure.

I always try to run the max the tire manufacturer will allow (currently 44psi) for two reasons.

1) Fuel mileage is always better.

2) Diamond Star Motors couldn't possibly factor all of the different tire brands, sizes, plies, and tread compounds when they made that door sticker.


In doing so I've noticed my tires wear much better- they generally wear very evenly where lower pressures will wear the edges before the centers. The ride quality suffers a bit, but the handling is much more responsive and the car feels less "wooshy" in turns.

True, if one knows how to read the sidewall of a tire, it does mention the max. PSI rating per tire at a given load weight for that said tire.

Thus, I go 80% of the max. rating for my tire pressure

I run stock 205/55R/16's on my Laser and I do 35 (which is the 80% of the max.PSI of the tire) on all four corners.

As what Justin mentions above: a firm ride, even wear and no worn corners on the tires, no 'squishy and mushy' turns and better mileage per gallon if I went down to the sticker readings.

We have a KIA Rondo that came with stock 205/60R/16s and I upped the size to 225/55R/16's when I got a new set to get a wider footprint with the same diameter, with major payout on improved gas mileage, more stability and 44 psi on all four corners.

Higher tire pressures will increase your MPG and slightly add tire tread life. As the tire pressure increases the 'contact patch' between the tire and road surface decreases. The smaller contact patch has less friction and therefore the tire life and MPG go up. On the other hand you lose tire performance. When you are drag racing or driving in snow/ice you decrease the tire pressure to increase the contact patch and increase friction. You can try this at home, put you car on a level surface. Put 40lbs of air in the tires and then push the vehicle. After you stop, reduce the air pressure to 30lbs and push again. You will notice a difference. Now, your low profile ZR rated tires will be harder to find this difference due to their design but the principle still works.

What basically everyone's saying is its up in the air. Different tires bend and form different ways. What i would do is look up the tire recommended and average that with the OEM recommended. A small misalignment in toe can make a bigger difference in tire wear than a small psi variance. Check you tires often for the common wear patterns and adjust from there.

I used to work for a wholesale tire company.,and we always ran 34 pounds at all four corners on 17" rims

I run to near the max the tire manufacturer will allow, whatever size rims.

I run 38psi with the same size tires, its a good medium for me

i wouldnt go over 40 psi for 17" rims

I know that you all are having fun throwing numbers around, but the pressures you should run depend on alignment and I haven't seen that mentioned yet.

Well I've been running 33psi front and 30 psi rear and it feels good but i feel like im wasting a shit load of gas which gas is not cheap.

For daily driving, I run 35 front 32 rear. But if I'm running 1/8 & 1/4 miles only, I drop down to 28 front 30 rear. But that's just for a ill more traction off the line.