Recommended air pressure?

[wingnut12]

Does anyone know the recommended psi for the General Exclaim 215/45/17's?

Got them installed today and they put in 40 psi which feels twitchy as hell. The steering feels lighter, and I think I can feel more body roll as well.

Should I lower it to 35 psi which is around what it was, or is there a 'right' answer?

Can over inflated tires cause what I've just described?

[yearoftherat]

Always put in what the recommended air pressure is for our cars as per manual or the decal on our door jams. If you run them at 40, you'll have a bald strip down the center of the tires eventually. Over inflated tires will cause what you're talking bout.

[wingnut12]

I reset them back to around 34 psi per corner.

The idiot at Walmart (yes I should have known, but how do you screw up a tire install?), had set them all up between 45-54 psi. It's a wonder I'm not dead.

[stealthman12]

I reset them back to around 34 psi per corner.

The idiot at Walmart (yes I should have known, but how do you screw up a tire install?), had set them all up between 45-54 psi. It's a wonder I'm not dead.

holy crap...45-54 psi..that's insane. the guy probably wasn't even payin attention to wut he was doin.

[Wild Weasel]

Yeah, that's downright dangerous. What's the maximum pressure listed on the sidewall? You should never come within 5 psi of that when inflating them.

If they're the same size as stock (and they pretty much are) then you're best sticking with the inflation recommended by Mazda.

[Elder_MMHS]

Recommended tire pressure is 32F/32R when cold. You can expect them to be ~10% higher when hot.
Max tire pressure depends on the tires. Stock 16" Toyos are around 45psi.

[blk_muzda]

I inflate my 215/45/17 to 32psi on the front wheels and they look really flat...like half the sidewall is gone and the front rims seems like it'll hit the ground. So I put 38psi front and 34 rear

[bubba1983]

mainly cause of extra weight due to the engine which prolly makes them seem flat!

[wingnut12]

I settled on ~34 psi each corner. Looks right, and more importantly, feels right.

[jaguar]

my father purchased a brand new outlander from a dealership and all 4 tires was set at 46.5 psi! The max for the tires was 45psi. Run them on the highway and it probably would have been 48.5psi. I trusted that dealership and didnt check the tires until 2 weeks later. My father had already put in 1000km by then.

Back to original post, I am currently running my RSA's on 32PSi. I usually like to boost it +2psi above recommendation but felt I need more grip.

[Fuman]

make sure ur tire pressure gauge is correct.
I just ran into a problem with mine, because after service at MOT, I checked my tire pressure. my Gauge said 35, but it sure as hell didn't. Double checked with my friend's it said 32.

I ran 32 psi last year (when the car is new). I've no idea what im running now since my gauage is busted but should be between 32-35psi

[bubba1983]

i run around 33 on all 4 corners

[cereal83]

I run them at whatever the dealer puts it to, not a big issue imo

[bubba1983]

in that case your all good, but for those of us who rotate our own tires, especially if we have more than one set, after having a set of tires sit for more than one season, they do loose air, and thus, we have to adjust accordingly, which in end result of this thread, gives us an idea of what other people inflat too...hows that for politically correct!

[Jetmech]

Tire pressure should be checked when the tire is cold as well as the pressure will be greater when the tire heats up. As was already posted go with the tire pressure listed on your door or door jamb of your car as thats what the car manufacturer recommends.

[bb1999jan17]

should i also put 32 psi for 225/40/18?

[-RJ3-]

should i also put 32 psi for 225/40/18?

Yes.. It doesn't matter what tire or size of rim you use, its specified by the car manual or door jams.

I'm running 32 on all 4 corners, Bubbs is right the tires seem flat but its different factors on what you have weighing your car down.

eg. Engine, audio system, bricks, etc...

[Wild Weasel]

Yes.. It doesn't matter what tire or size of rim you use, its specified by the car manual or door jams.

I'm running 32 on all 4 corners, Bubbs is right the tires seem flat but its different factors on what you have weighing your car down.

eg. Engine, audio system, bricks, etc...

Not necessarily. I find that with the lower profile tires, I had to bump up the pressure just a little. Of course, I went from 16's to 18's which is a bigger difference.

If I ran 35 on my Sunfire with the 16's, I think I ran 38 with the 18's. There's less sidewall to flex so I wanted a little more pressure holding things up.

What I recommend is to start with exactly what they recommend. So stick with 32 or whatever it is. Then, after a few thousand km's, take a look at the tires and decide if you need a little more. If they're wearing more around the outside or appear to be rolling over on the sidewalls a little, then add another pound or two.

[wingnut12]

I learned this the hard way by getting them installed at Walmart.

But their incompetence taught me a lot about the importance of paying attention to ones tires.

[majic]

36 psi all around on my General Exclaim UHP 215/45/17

more grippy/less squirmy than when i originally put 32psi all around

[Elder_MMHS]

I realized no one answered some of the OP questions - yes, lighter steering and floaty handling are common symptoms of over-inflation. Basically your tire becomes so stiff that your contact patch is significantly reduced so you get less grip.

[sp3GT]

Are most people running 34psi right now? I don't even know what my tires are at never checked. I seem to be getting bad fuel economy lately, do you guys just do it at the gas station?

[wingnut12]

I'm now running around 34 psi, and it feels like I'm rolling on sticky tape. Huge difference.

Yes, there's no reason you can't do it yourself at the local gas station.

[Voodoo]

I have 32 psi at rear, 36 psi at front. just sweet

[Fuman]

Not necessarily. I find that with the lower profile tires, I had to bump up the pressure just a little. Of course, I went from 16's to 18's which is a bigger difference.
If I ran 35 on my Sunfire with the 16's, I think I ran 38 with the 18's. There's less sidewall to flex so I wanted a little more pressure holding things up.

really? i found that with lower profile tires I had to lower the psi.
I'm running 35psi at 20 degrees celsius, cold tires (stock suspension, 17'' RS-As). I used to run 40 psi on my old car. maybe cause it was old, so I had to bump it up, and it wasn't the tire profile.

can you explain a bit as to why, u have to bump it up on a lower profile tire??

[cyberscorpi0]

should i also put 32 psi for 225/40/18?

I have 40 all around for my 18".

[-RJ3-]

I have 40 all around for my 18".

Wow... I'm still on 32--35 with your similar setup.

[Tizmee24]

wat is better air pressure for 225/45/17

[spyder]

I know this is trivial but just remember when you are reading tire pressure, you must have your car cooled/undriven for 3+ hours to get a true reading therefore if you get the dealership to test them...and your car is only there for a couple of hours...it really isn't accurate. Also if you plan on adding air and you want a good/accurate reading, minimizing the drive to the air compressor to under 1km will keep your pressure reading accurate assuming your car was 3+ hours cool.

Cheers!
Spyder

[sp3GT]

Right now I'm doing 34 in the front and 38 in the back, I really like it. I'm sorta getting better fuel economy as well.

[Fuman]

also, rule of thumb is 10 degrees F for 1 psi. To convert from Celsius to Fahrenheit: multiply by 1.8 and add 32.
http://www.dunlop.ca/care/proper_inflation.html

[Zubbie]

Just finished washing my car and thought i'd check the tire pressure.

My pressure was anywhere from 42 - 46!!!

I lowered it to 33 - 36 and now my front tires look like they're low.

My fronts have a pressure of 33.5 and 34... does everyones tires look like they're low?

[Fuman]

Just finished washing my car and thought i'd check the tire pressure.

My pressure was anywhere from 42 - 46!!!

I lowered it to 33 - 36 and now my front tires look like they're low.

My fronts have a pressure of 33.5 and 34... does everyones tires look like they're low?

if you live near 16/bayview, use the air refill station at petrol canada, the one they have there is AWESOME.

Don't worry if it looks low as long as your pressure is right.
edit: were your tires cold?

[Zubbie]

I washed my car in the sun, then it was parked in the shade for at least 30 mins... so I think they weren't too hot.

[cyberscorpi0]

Wow... I'm still on 32--35 with your similar setup.

How's the ride with that T.Pressure?

I find the car feels like running flat tire with 32--34.

[fastNugly]

I reset them back to around 34 psi per corner.



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