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Old 01-08-2018, 06:44 PM   #1
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Tire Pressure

Hi guys;

Quick question....on a 2000 Diplomat what should I set the tire pressures too with all the tanks empty?

I realize the proper way to do it is to weight it and adjust them accordingly but I have an opportunity to take it out for a spin tomorrow while moving.

We have always had them at 120 PSI and Dad mentioned it always road harsh unless the tanks were full. I would extrapolate from that the pressures were too high. So I was thinking of softening them up before the run tomorrow but don't know what is too low. I was thinking 100 PSI or perhaps 110. What would you guys guess would be good for a non-loaded guess?
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Old 01-08-2018, 07:45 PM   #2
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Until you weight your coach and look at tire manufactures weight chart. I would use whatís posted on the manufactures card on the lower wall next to drivers seat. Of course itís based on the OEM tires that cane with coach. But itís a good starting point until you weigh your coach.
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Old 01-08-2018, 08:42 PM   #3
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Imo, you're asking for trouble by relying on advice from others (in this instance). Especially considering that you have provided nothing in the way of details related to your specific situation. Not the least of which, information about the tires! We have no idea of the Brand, size, load rating, what the maximum pressure is or any pertinent details related to the most important component of this question. Next, are the specifics of your coach... Single or tandem axle, estimated weight per axle. Telling us the tanks are empty really means nothing when we don't have the starting weight of your coach.

My point is, there are certainly plenty of people willing to tell you what pressure you should run in your tires. EVEN WITHOUT ANY OF THE INFORMATION REQUIRED to answer such a question. I run 120 PSI in my front and 100 PSI in the Rear. But, that information shouldn't help you at all (for the same reasons stated above).
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Old 01-08-2018, 10:49 PM   #4
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For what its worth I agree with Boomer. We are talking about a test drive here, not a thousand mile journey. Don't over think it.
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Old 01-09-2018, 06:26 AM   #5
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Originally Posted by Kurt Averill View Post
For what its worth I agree with Boomer. We are talking about a test drive here, not a thousand mile journey. Don't over think it.


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Old 01-09-2018, 07:06 AM   #6
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Use what’s on the placard.
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Old 01-09-2018, 12:25 PM   #7
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For what its worth I agree with Boomer. We are talking about a test drive here, not a thousand mile journey. Don't over think it.
Thanks - that's what I was thinking too
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Old 01-13-2018, 01:45 PM   #8
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Originally Posted by BobJones View Post
Hi guys;

Quick question....on a 2000 Diplomat what should I set the tire pressures too with all the tanks empty?

I realize the proper way to do it is to weight it and adjust them accordingly but I have an opportunity to take it out for a spin tomorrow while moving.

We have always had them at 120 PSI and Dad mentioned it always road harsh unless the tanks were full. I would extrapolate from that the pressures were too high. So I was thinking of softening them up before the run tomorrow but don't know what is too low. I was thinking 100 PSI or perhaps 110. What would you guys guess would be good for a non-loaded guess?

Bob your 2000 Dip has a 10,000 front axle and a 19,000 rear axle and came with 255/70 tires
Front tires at 105 psi 5065# x 2= 10,130
Rear tires at 115 psi 5070 # X 4 = 20280
Rear. at. 110 psi 4675 # X 4 = 18,700

But if it came with 275/70 and i think the later 2000 Dip did
Front at 90# 5080 X2 = 10,160
Rear at. 90# 4750 X 4 = 19,000

The above pressures were off of a Goodyear chart

I had a 1999 Dip and went to the 275/70 tires (TOYO )

Just for infomation check your rear hitch i think it is a 5,000 insted of 10,000 hitch.
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Old 01-13-2018, 04:27 PM   #9
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Considering Walt's data, it seems strange OP's dad was running 120 psi. I'm guessing the tires are rated heavier than the axles. Too many unknowns...

Even though OP is just taking the coach "for a spin", he took the time to ask the question... I believe he's looking to learn... "Don't overthink it"- "it's just a test drive". He can get that from anyone; the gas station attendant, a neighbor, wife / girlfriend etc. I choose to believe this forum is to help people learn, not to make them feel silly for asking a question.
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Old 01-13-2018, 04:31 PM   #10
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If you don't have weights to properly set tire pressures, then inflate to max listed on the tire sidewall. IMHO.

Yes, this will likely result in a harsher ride than it dad to be... Get it weighed.
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Old 01-13-2018, 07:36 PM   #11
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Great info people - I guess I should have weighed it but time was short and it's now in a new park in a long-term area so I will probably be here for a while, meaning I won't be able to weigh it easily until the next test ride.

In the meantime, just to clarify, we had the pressures at 120 (the max rated pressure) and Dad said it road a bit harsh unless all the tanks were full. He said that made a big difference. Just reporting the news - not making it - but it's been all over North America on some pretty big rides from west to east and everywhere in between.

I just took a look at the tires, they are Michelin Pilot X - XZE in a 255/70/R22.5 on all corners. The load chart seems to be here, on page 39 http://tiregroup.com/Catalogs/PDF%20...s/Michelin.pdf

but I can't make heads or tails of it. The placard behind the driver's wheel shows what Walt so kindly reported, front = 10,000 rear = 19,000

Is that enough information to ball-park it? Just thinking I could adjust them now that it's stationary again and have it ready for the next test flight.

I might have made some more progress, it looks like the pressures should be 105 front & 115 rear according to this table;

https://www.michelintruck.com/en_CA/...or/#!/info/xze
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Old 01-13-2018, 07:46 PM   #12
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If you don't have weights to properly set tire pressures, then inflate to max listed on the tire sidewall. IMHO.

Yes, this will likely result in a harsher ride than it dad to be... Get it weighed.
Pressure molded into the sidewall of truck type (over 10,000# GVWR) are Not the maximum the tire should ever have. It is the Minimum to support the maximum rating of the tire. Go read the manufacturers truck brochures.
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Old 01-13-2018, 08:23 PM   #13
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This might help Bob, i would susgest that you go to 275/70 on the next tires purchase.
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Old 01-13-2018, 08:28 PM   #14
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This might help Bob, i would susgest that you go to 275/70 on the next tires purchase.
That does help (as did your other post - thanks!). I would read that as 105 front & 110 rear.

This makes me wonder, does the tire placard behind the driver infer that all the tanks are full?

I think I'm going to have to weigh it with the water/grey/black tanks empty. Perhaps the pressures could be lower yet.

Edit: Looking at the placard it's calculated with the fresh water tank full and the other empty.
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