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  #1  
Old 12th October 2006
slicef96 slicef96 is offline
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Cool Tire Pressure

Can someone tell me the factory recomended tire pressure on a 2000 9-5. The tires failed early and I am bringing them in for warranty replacement. when I do I want to be sure they can not try to get out of the warranty on grounds of over/under inflation.
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  #2  
Old 12th October 2006
ppetree ppetree is offline
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This brings a life long question of mine to the front:

I have almost 160,000 miles on my 9-5 so obviously I have gone through some tires...

Here's my question: Do you follow the tire manufacturers recommended max pressure or do you follow Saabs?

Saab calls for something like 32 or 35 psi while the tire manufacturer calls for 42. My tire place (tire kingdom) says to go with the saab value but they are in the business of selling tires! Which value is right? Who do you believe?
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  #3  
Old 12th October 2006
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stipud stipud is offline
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The value on the tires is the MAX pressure. Having it too high will curve the bottom of the tire out, so that the center wears out faster. You should definitely use the SAAB rating... most other cars are in the 30-35 ballpark as well.
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  #4  
Old 12th October 2006
ppetree ppetree is offline
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Yep, the value is the max...

And having the pressure to high will cause the tire to "baloon" and will wear out in the center...

OTOH, having it too low has two negative effects:
      1. the tires will wear out on the outer edges faster;
      2. your gas mileage will suck!
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  #5  
Old 12th October 2006
Bjaardker Bjaardker is offline
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Being a MPG nerd (my other car is a honda insight), I go with the max PSI on the wife's SAAB. When I had a 9-3 for my vehicle I went max PSI on it too. No ill effects either way & I got even wear the whole time. If you exceed the manufacturer's max though, you will get uneven wear.

Then again... if you're like me, that's ok . I'm running 50PSI all the way around on the insight.
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  #6  
Old 12th October 2006
ppetree ppetree is offline
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Just to be clear, when you say "max PSI on the wife's SAAB" whose max? Saabs or the tire manufactuer?
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  #7  
Old 12th October 2006
Bjaardker Bjaardker is offline
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The manufacturer's max PSI. Is what I'm referring to. The way I look at it is this, they made the tire, they probably know what the pressure limit is before it will wear unevenly. Plus they have a vested interest in even wear since they're the ones who will have to honor the wear warranty should it wear too quickly.

Now that winter is here I'll probably drop it a 3-4 lbs.
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  #8  
Old 12th October 2006
ppetree ppetree is offline
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Winter? <shudders> Winter for me is anything where the temp is below 70! LOL

I agree with your logic, just had the Tire Kingdom keep telling me that I should use the Saab rec pressure...

Maybe I should check it out on the perelli site and see what they say...
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  #9  
Old 13th October 2006
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i just had a new trye fitted to my 9-5. the conti sports contact 2 was pumped to 33 as i asked him what it was
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  #10  
Old 13th October 2006
ppetree ppetree is offline
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Asked who what it was? The tire dealer? The Saab dealership?

The question still remains, if the tire manufacturer calls for a maximum tire pressure which is significantly different from the maximum called for by Saab, which do you follow?
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  #11  
Old 13th October 2006
Gazolzwurf Gazolzwurf is offline
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The max setting on the tyre is the maximum pressure the tyre will hold.

The guides that Saab offer are simply that, a guide.

Road surface, vehicle weight, speed, comfort etc all affect what tyre pressures are required.

It's an individual setting for your car.
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Old 13th October 2006
ppetree ppetree is offline
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Goodyear:
Proper inflation is the single most important part of tire care. The inflation pressure on the side of the tire is the MAXIMUM operating pressure. It is not necessarily the right inflation for your vehicle. Always use the inflation recommended by the vehicle manufacturer. You can find it in your owner's manual, posted on the edge of the driver's door, on a door post or on the inside of the glovebox door. Always check inflation when tires are COLD: when the vehicle has been driven less than a mile or one hour or more after driving. Use a good quality tire gauge. Note: It's natural for radial tires to have a slight bulge in the sidewall at their proper inflation pressure. Check or adjust inflation every few weeks, before any long trip or if traveling with a heavy load. And don't forget to check the spare. Your Goodyear retailer can answer any questions you may have about tire inflation.

Pirelli:
Please note that 'suggested inflation pressure levels' do not exist.
The correct inflation pressure value is that which is recommended by the vehicle manufacturer and can be found in the vehicle owners manual and the door placard. Inflation pressure checks should be made only when tyres are cold. Tires are considered to be cold when they have not been run for at least one hour or have only been run at low speed for not more than one to two miles. Check cold tire pressure frequently (at least every two weeks) and always before long trips, not forgetting the spare tire!

Michelin:
Always inflate your tires to the recommended pressure listed by your vehicle's manufacturer. This information can be found in the owner's manual and often on a placard located in the vehicle's door jamb, inside the fuel hatch, or on the glove compartment door.

Bridgestone via www.tiresafety.com
Check your owners manual for the recommended tire pressure from the manufacturer.
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  #13  
Old 13th October 2006
Gazolzwurf Gazolzwurf is offline
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Of course they are all going to say 'The correct inflation pressure value is that which is recommended by the vehicle manufacturer '

I wouldn't expect anything else.

Who's gonna cover their ar*e if somebody has a tyre failure with one of their tyres that was inflated to a pressure other than that recommended by the manufacturer?
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  #14  
Old 13th October 2006
brewtide brewtide is offline
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So, I'm bumming around from another forum (OG93 boy here...)...

I've found that ~36 PSI in the fronts, and ~33 in the rear do the 'trick' for my car; Amazing handling + ride comfort...

Your 95's are heavier; But perhaps try a similar ratio.

-bny
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  #15  
Old 13th October 2006
ppetree ppetree is offline
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I need to try something because running my tires at the Saab recommended pressure is causing slight wear on the outside edges - a clear sign of under inflation. I think I'll boost it up and split the difference between what Saab says and what the max tire pressure is... probably pretty close to your 37/38.
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  #16  
Old 13th October 2006
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Palmiye Palmiye is offline
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I have 235/45/17 on my 9-5 Aero and use 40 psi in all four tires, I've tried them all.
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  #17  
Old 13th October 2006
denmaster denmaster is offline
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How long is a piece of string?

Depends on the suspension setup, tire sidewall stiffness, preference for comfort, amount of load regularly carried, type of driver/driving etc etc.

I have RHK and 235/45/18's on falken FK-452, generally prefer comfort and don't normally have more than three people in the car. I like understeer/neutral bias with the tail only coming out on lift off. I use 32/30 daily and 38/35 when driving enthusiastically

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  #18  
Old 14th October 2006
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I have tried so many different tyre pressures on my 9-5 and certainly had lots of varying advice. Certainly in the UK on standard Saab wheels I recon somewhere between 32 - 36psi depending how how you drive. Lower and you will start to run the side walls on corners. Over 36 and the car gets skittish. Just my 2 penninth worth.
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  #19  
Old 16th October 2006
slicef96 slicef96 is offline
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As many have stated the MAX PSI on the tire is just that, the recomended MFG pressure is not only for proper wear but handling as well. The suspension and emergence maneuverability is counting on a certail amount of rubber roll. If that give is not there due to too much pressure of if there is too much give due to pressure too low you run a greater risk of losing control.

In my experience I generally run 2-3 PSI over the manufacturers spec. This is what is usually recomended for emergency vehicles for optimum performance
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