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Old 06-11-2017, 02:39 PM   #1
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Question Confused About Setting TPs on '14 DS 4018

I realize that weighing the coach is the way to go in terms of accurately determining the appropriate tire pressures for my motorhome, but I just acquired it and have not yet had an opportunity to load it up and weigh it. I’d like to have a starting point and so am attempting to calculate what would be prudent & safe until I get a weighing done.
Here is what I have for parameters for my 2014 Newmar Dutch Star 4018:
Tires: Michelin XRV 305/70R 22.5
Front GAWR: 14,600 lbs.
Rear GAWR: 20,000 lbs.
Tag GAWR: 10,000 lbs.
According to the Michelin Tire Pressure Chart for the XRV, at 110 psi the tire has a load rating of: 7,300 lbs. which, times two, is enough to support the full front axle rating of the coach (NOTE: the max. “single” rating of the XRV tire is: 7,830 lbs. @ 120 psi).
Also according to Michelin’s chart, at 80 psi the tire has a load rating of: 10,030 lbs., which, times two, is enough to support the full rear axle rating of the coach (NOTE: the max. “dual” rating of the XRV tire is: 13,880 lbs. @ 120 psi).
And, again according to the chart, at 75 psi the tire has a load rating of: 5,375 lbs. which, times two, is enough to support the full tag axle rating of the coach.
So, my question is: Would it, before getting the coach weighed, be prudent & safe to start with 110 psi at the front tires, 80 psi at the rear dual tires, and 75 psi at the rear tag tires?
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Old 06-11-2017, 03:35 PM   #2
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I have a 2015 DS 4018 and have had it weighed and I run 110 in front 85 in the rear and 80 in the tags. I think you should be ok.
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Old 06-11-2017, 03:52 PM   #3
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Hi TrailerFool,
Yep your math and judgement is correct. What you are going to do is the method I would use. Last time I looked, for my tires, Michelin minimum PSI was 85 no matter what the minimum weight is. Just make sure you are not under Michelin's minimum PSI for the tire.
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Old 06-11-2017, 04:13 PM   #4
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"TRailer Fool"......I have the same coach as you. After three years, I've found good tire wear and best ride at 110 Front, 85 duals and 85 tag.
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Old 06-11-2017, 04:41 PM   #5
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I ran 100 up front and 85 in the rears for 10k miles. Monitored tires with the Eez tpms and it worked just fine. Didn't see any wear at all.
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Bill
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