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Old 10-30-2014, 04:31 PM   #29
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Thanks to all, especially for not insulting my lack of knowledge. The reason I'm checking is that the fronts (which are much easier to check) are up at 76 PSI which means the dealer can't read door stickers. So, now I want to check them all because I'm sure they are all overinflated./ I'm just annoyed that I've driven 2,000+ miles without checking. BTW, every time I take my other vehicles in for tire service, they come back overinflated. Must be some sort of routine they all follow.
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Old 10-30-2014, 05:15 PM   #30
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I consider the 'tire pressure' discussion to be on par with religion and politics; every one has an opinion and their opinion is right.
Personally, I had the same questions as you. Shouldn't I have more pressure when the van is loaded? The door sticker is the Mercedes Van recommendation. Airstream modified it and added a lot of weight. The pressure should be increased. Etc, etc.

I went thru the weighing option, but never got a good answer from anyone. Sure, i've seen the GoodYear charts, however, I'm driving on Michelins. I can't find a chart for them. I wrote the GoodYear crew to get an interpretation of their tables. They told me to go to a local GoodYear tire dealer. I went to 2 different ones; neither could give me advice (I posted my GY letter on this forum or the SprinterForum site. I don't believe I received any good responses. I'd post it now, but I'm on my iPhone and it's too difficult to navigate/view while in a car).

The bottom line is that I follow the door sticker. 61psi all around. BTW, there is also an Airstream sticker (in addition to the OEM) that states 61 psi. I've been running that pressure for about a year with good results.

As far as the rear tire valves go, get yourself an early Christmas present and order some valves designed for our application. Check out http://www.duallyvalve.com. For my 2012 EXT, I ordered the DL1SPAL. Well worth every penny.


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Old 10-30-2014, 10:28 PM   #31
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Quote:
Originally Posted by kaylorsan View Post
?....
I went thru the weighing option, but never got a good answer from anyone. Sure, i've seen the GoodYear charts, however, I'm driving on Michelins. I can't find a chart for them........

The bottom line is that I follow the door sticker. 61psi all around. BTW, there is also an Airstream sticker (in addition to the OEM) that states 61 psi. I've been running that pressure for about a year with good results.

As far as the rear tire valves go, get yourself an early Christmas present and order some valves designed for our application. Check out http://www.duallyvalve.com. For my 2012 EXT, I ordered the DL1SPAL. Well worth every penny.

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The Michelin tire pressure charts are in this document, page 18:
https://www.michelinb2b.com/wps/b2bc...s_Brochure.pdf

... and here on page 20:
http://read.dmtmag.com/i/58068/21

61 psi is the Mercedes recommended tire pressure for a Sprinter 3500 running at max GVW of 11,030 lbs. It's really just hard engineering data, but everyone is entitled to there opinion on the Internet.

I also have those dually valves - they are great! After installing the dually valves with my new Michelins I added a TPMS so I won't repeat my experience of running an inner dual flat. Fortunately I noticed it during a tire check at a rest stop in Arkansas this spring. Got the spare installed courtesy of Coach Net.


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Old 10-31-2014, 03:27 PM   #32
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The valve for the outer wheel is pointing inwards unfortunately, and is usually positioned on the opposite side from the inner valve. It's a hands and knees job (hard for me since I have bad knees) and you'll also need a flashlight to see it. You'll also need a tire gauge and tire inflation equipment with a dually head.
You can get U-shaped extended valves, but they are a pain and quite expensive to have installed.
Be careful of the valve extensions you have on there now - they are flimsy and can break easily.
I must be losing whatever marbles I have left. Based on this specific info, I went back to those rear tires, but I can't seem to find ANYTHING on the inside of the rim. In any case, how do you get in there? The two tires only have maybe 2" between them. I can't get my hand more that finger length deep, nowhere near far enough to feel around for a stem, not to mention how to get a gauge in there. What am I missing? Be kind... I used to be pretty smart.
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Old 10-31-2014, 04:18 PM   #33
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I must be losing whatever marbles I have left. Based on this specific info, I went back to those rear tires, but I can't seem to find ANYTHING on the inside of the rim. In any case, how do you get in there? The two tires only have maybe 2" between them. I can't get my hand more that finger length deep, nowhere near far enough to feel around for a stem, not to mention how to get a gauge in there. What am I missing? Be kind... I used to be pretty smart.
Go in through the gap in the spokes on the outer wheel, not between the tires.
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Old 10-31-2014, 04:30 PM   #34
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I must be losing whatever marbles I have left. Based on this specific info, I went back to those rear tires, but I can't seem to find ANYTHING on the inside of the rim. In any case, how do you get in there? The two tires only have maybe 2" between them. I can't get my hand more that finger length deep, nowhere near far enough to feel around for a stem, not to mention how to get a gauge in there. What am I missing? Be kind... I used to be pretty smart.
Look at the front wheel and it's in the same place on the outside dual. As Protag said, it's accessible thru the hand-hole.
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Old 10-31-2014, 04:38 PM   #35
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Go in through the gap in the spokes on the outer wheel, not between the tires.
Duh... now I REALLY feel dumb. Of course, there they are. Why didn't I think of that? Now I can sleep tonight.....
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Old 10-31-2014, 04:46 PM   #36
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Duh... now I REALLY feel dumb. Of course, there they are. Why didn't I think of that? Now I can sleep tonight.....
Well, I apologize for my poor choice of words: should have said something like diametrically opposite the valve for the inner wheel and viewed through the outer wheel from the outside! Or something like that.
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Old 10-31-2014, 04:47 PM   #37
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Duh... now I REALLY feel dumb. Of course, there they are. Why didn't I think of that? Now I can sleep tonight.....
Don't feel dumb. You're smarter now than when you asked the question, and that's all that counts.
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Old 04-21-2015, 08:42 AM   #38
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2008 Sprinter Manual Tire Inflation Pressure

Page 628 in my 2008 Manual recommends 55 psi front and 61 psi rear for
LT 215/85 R 16 115/112 N or Q tires. These numbers are also posted on the door post labels. The front OEM tires were badly worn and cupped on the outer edges at 23,000 miles ( never rotated) and I have replaced all six at 34,000 miles and plan to inflate them all to 61 psi.
But, why does my Manual recommend 55 psi in the front while newer models recommend 61?
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Old 04-21-2015, 09:11 AM   #39
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But, why does my Manual recommend 55 psi in the front while newer models recommend 61?
My 2011 Sprinter manual still recommends 55psi for the front tires for any Sprinter 2500 and any Sprinter 3500 with a GVWR of less than 11,030 pounds. Only the 11,030 GVWR Sprinter 3500 models have a recommended front pressure of 61psi. Reason being, the higher GVWR requires higher pressure to support it.
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Old 04-21-2015, 07:16 PM   #40
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I would think you'd be better to go by the sticker on the door jamb. Mine says 61 psi all around.
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Old 04-21-2015, 09:21 PM   #41
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The front OEM tires were badly worn and cupped on the outer edges at 23,000 miles ( never rotated)
When you do alignment, have the camber set to the closest setting to vertical as the spec allows. May require special camber bolts to achieve this. That will minimize the outer edge cupping if my theory is correct. Don't have enuf miles on mine since rotating and aligning to check.
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Old 04-21-2015, 09:42 PM   #42
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When you do alignment, have the camber set to the closest setting to vertical as the spec allows. May require special camber bolts to achieve this. That will minimize the outer edge cupping if my theory is correct. Don't have enuf miles on mine since rotating and aligning to check.
Outer edge wear is a sign of improper camber, as you suggest. But "cupping" can more often be traced to improper wheel balancing. Don't assume that the wheels were properly balanced when you bought the van.
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