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Correct Tire Pressure

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Old Feb 18, 2012 | 08:49 AM
  #1  
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Correct Tire Pressure

I know MB recommends tire pressure of 44 & 46 psi but this seems very high compared to most cars.

When the tires get hot this pressure would rise significantly.

For track use, high pressure may be right but for street use this seems awfully high to me.

What are you guys running for pressure to compromise between tire wear and handling on the street?
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Old Feb 18, 2012 | 10:09 AM
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Where do you get 44 and 46? IIRC, it's 39 and 41 with just you in the car.
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Old Feb 18, 2012 | 10:23 AM
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Inside the gas cap. Two sets of numbers. Light load and heavy load. Somewhere between the two is your perfect personal set of numbers. My taught me this.

Wayne
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Old Feb 18, 2012 | 10:26 AM
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Correction: That should be the inside surface of the gas filler cover door. Open the door like you were filling up the car and you will see the chart.

Wayne
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Old Feb 18, 2012 | 12:08 PM
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I just checked the recommended tire pressure on the inside of the drivers side door, it said 46 and 51psi front and back respectively on the 19" wheels!

PitPony, what TP are you running on the winters?
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Old Feb 18, 2012 | 01:00 PM
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I'm running 42 all around. There is a notice on Tirerack that this is the minimum pressure to maintain the load rating. So that is where I set mine. I will adjust for the track when the time comes.
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Old Feb 18, 2012 | 03:23 PM
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I'm running 41-42 all around with the winter 225-18".

I'm researching best pressure for the summer 255 & 235 18" for best tire wear on the street.
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Old Feb 18, 2012 | 03:25 PM
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37-39 here
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Old Feb 18, 2012 | 04:02 PM
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On the gas cap lid, MB recommends 41+psi for the winter tire set up.
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Old Feb 19, 2012 | 09:03 AM
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Originally Posted by Pit-Pony
I know MB recommends tire pressure of 44 & 46 psi but this seems very high compared to most cars.

When the tires get hot this pressure would rise significantly.

For track use, high pressure may be right but for street use this seems awfully high to me.

What are you guys running for pressure to compromise between tire wear and handling on the street?

I just picked my car up yesterday and they had the tires set to the recommended pressures. I have read a lot of threads where people have posted running in the high 30's rather than the recommended 40's Could running lower play one part in the quick wear that everyone talks about?
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Old Feb 20, 2012 | 12:45 PM
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Always set tire pressure COLD!
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Old Feb 20, 2012 | 01:01 PM
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Yes
Tire pressure from the dealer brand new was 45/46/47PSI all around. Dont remember which was which.
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Old Feb 20, 2012 | 01:56 PM
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A couple of fast cars.
40 all around.
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Old Feb 20, 2012 | 09:23 PM
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I'm running 38 psi all around.
I have 19" wheels though. Dunno if that makes a difference or not.

Last edited by _AMG_; Feb 21, 2012 at 01:39 AM.
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Old Feb 20, 2012 | 09:30 PM
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Originally Posted by stangxs
37-39 here
Lol 35-35here But it grips.
(cold)
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Old Feb 21, 2012 | 08:33 AM
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So, we are all over the place. Situation normal
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Old Feb 21, 2012 | 08:34 AM
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Cool

Originally Posted by Pit-Pony
So, we are all over the place. Situation normal
Aye. Never have so many said so much about so little. This is worse than the never ending question of which B&W film developer to use. Ask 100 people and get 200+ answers.

Wayne
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Old Feb 21, 2012 | 05:17 PM
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I just installed new tires and i noticed that I kept losing air. Took it to the dealer and he filled all four to 40. I just checked three hours later and both back tires went down to 33. I took it to a shop and they said the tire sensors are leaking the air. I have not hit any pot holes or bumps and I've only had them on for about a month. The guy told me maybe while they were being mounted to the rim, he messed my sensors up. Sorry to jack the thread but I need some help
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Old Feb 21, 2012 | 05:48 PM
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ok

ok so what it the psi again
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Old Feb 21, 2012 | 07:01 PM
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U guys make this way too hard. Read the manual, take it to the dealer, problem solved. Or call your SA and ask what the psi should be if you can't read off the gas cap.
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Old Feb 21, 2012 | 10:57 PM
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All MB SE will tell you is to follow what's on the car label drivers door/gas door.

It may be better to use less pressure though.

I'm asking for people's experience for making the tires last and a compromise street performance.
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Old Feb 21, 2012 | 11:32 PM
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Originally Posted by Pit-Pony
All MB SE will tell you is to follow what's on the car label drivers door/gas door.

It may be better to use less pressure though.

I'm asking for people's experience for making the tires last and a compromise street performance.
This has been covered many times in the past but a certain number of us use pressures in the 36-38psi range. I do, for the best combination of handling, ride comfort and even wear across the tread. YMMV.
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Old Nov 17, 2012 | 03:07 PM
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OK. So I took off the Pirelli's I burned up in 6000 miles and the wear definitely looks like overinflation on the rears.

I was running at 38 or so on the 18" OEMs.

The new PSS's are going on now and they said to keep them at 34 or so.

Is this too low? It looks like everyone has an opinion, but I know there are a lot of PSS lovers here.
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Old Nov 17, 2012 | 03:47 PM
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Question

Originally Posted by Dogtag114
OK. So I took off the Pirelli's I burned up in 6000 miles and the wear definitely looks like overinflation on the rears.

I was running at 38 or so on the 18" OEMs.

The new PSS's are going on now and they said to keep them at 34 or so.

Is this too low? It looks like everyone has an opinion, but I know there are a lot of PSS lovers here.
Definitely too low....IMHO.
Don't forget you're running low profile rubber, & with that low pressure, you are lessening the "cushioning" barrier that you need to protect your rims if you hit a rock or something.....you are more likely to suffer tyre damage which can then more easily transmit to the rim....I'd be going a MINIMUM of 38.
Cheers, Pickles.
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Old Nov 17, 2012 | 04:08 PM
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I definitely agree with Pickles... 34 is too low. Anything less than 42 and Tire Rack told me they no longer have the same load rating and it is too low for the car. I run 42 all around and my PSS wore perfectly evenly... outside measured within 1/32nd of the middle on all 4 tires (this included a couple of track days). I would bet 34 and the outsides wear horribly. I also found anything below 40 and the tire felt sloppy and the sides rolled.
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