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Old 10-29-2014, 09:06 AM   #1
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Tire Pressure

Does anybody know what the proper tire pressure is on the Interstate? I have mine at 80 psi because that's how the dealer had it, but I also read on this forum somewhere that it should be 61. Any down side to keep driving at maximum pressure other than rougher ride? My thought is I don't have to worry about inflating the tires when I load up the van, if it's already at 80 psi.
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Old 10-29-2014, 09:15 AM   #2
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Weight each axle and use the inflation chart. Note all tires of the same size can use this chart independent of manufacture.

The pressure noted on the sidewall of a tire is a Max. The pressure noted on the vehicle door does not consider the load and may be high or low depending on that.

http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf
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Old 10-29-2014, 09:17 AM   #3
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On the Sprinter 3500 chassis, 61psi is the correct pressure on all six LT215/85R Spped Range Q tires, according to page 283 of the Spinter Operator's Manual.

On the Sprinter 2500 chassis, however, the front tires should be at 47psi and the rear tires at 70psi.

If you over-inflate the tires, two important things happen:
1 - You get excessive tire wear in the center of the tread;
2 - You have reduced braking effect because you've got too little tread in contact with the pavement; this also reduces the effect of the Electronic Stability Control system.
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Old 10-29-2014, 09:23 AM   #4
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Wow, such quick replies! Thank You!
I was hoping I didn't have to deal with weighing the van... Oh well.
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Old 10-29-2014, 09:28 AM   #5
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Originally Posted by cjrdad View Post
Wow, such quick replies! Thank You!
I was hoping I didn't have to deal with weighing the van... Oh well.
If you go by the Sprinter Operator's Manual, you don't have to weigh it.
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Old 10-29-2014, 09:43 AM   #6
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But does the Sprinter van manual take into account all the added weight of the Interstate conversion?
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Old 10-29-2014, 09:45 AM   #7
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But does the Sprinter van manual take into account all the added weight of the Interstate conversion?
It's based on the Gross Axle weights, so it accounts for fully-loaded vans. If anything, it would leave tires slightly over-inflated for the empty condition of a baseline Sprinter.
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Old 10-29-2014, 09:50 AM   #8
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61 it is then. Thank you.
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Old 10-29-2014, 09:56 AM   #9
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Those pressures seem awfully low for a van loaded to the max. Jim
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Old 10-29-2014, 10:02 AM   #10
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Those pressures seem awfully low for a van loaded to the max. Jim
That's what I've been using on my Interstate for the past three years, with no problems at all. The ride is fine, handling is fine, tire wear is uniform across the entire width of all six tires. Tires do not get hot (a sure sign that they're under-inflated); in fact, here along the Gulf Coast, the tires are often cooler to the touch than the pavement they're running on.
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Old 10-29-2014, 11:17 AM   #11
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I inflate mine to 61 or 62 psi. Seems to ride well and handle the load fine. Tires appear to be wearing evenly as well.
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Old 10-29-2014, 11:52 AM   #12
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61 psi works for me.
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Old 10-29-2014, 08:14 PM   #13
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I'm good with 61/62 psi
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Old 10-29-2014, 09:20 PM   #14
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As a side question, what do you all use to ensure you get your pressures this accurate?
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