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Old 10-16-2017, 09:48 PM   #1
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Need baseline for tire pressures

We picked up our 2017 DSDP 4369 the end of June and haven't found the time or place to have it weighed yet to help determine the correct tire pressures we should be running. I'm just curious what others with the same coach are running in their tires to help me determine a baseline to use until I can get it properly weighed. I've tried searching on this topic and the only pressure recommendation I could find was 85 psi on all the rears and 110 on the steer axle. Thanks in advance for your suggestions.
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Old 10-16-2017, 09:51 PM   #2
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85 rear and 120 front. Based on our weight we were told 130 front but it rides like an old dump truck.

Bob, Pat and Daisylee the JackABee
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Old 10-16-2017, 09:53 PM   #3
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Quote:
Originally Posted by allworths View Post
We picked up our 2017 DSDP 4369 the end of June and haven't found the time or place to have it weighed yet to help determine the correct tire pressures we should be running. I'm just curious what others with the same coach are running in their tires to help me determine a baseline to use until I can get it properly weighed. I've tried searching on this topic and the only pressure recommendation I could find was 85 psi on all the rears and 110 on the steer axle. Thanks in advance for your suggestions.
Those are excellent values to start with. Do you have the 365s up front or 315s?
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Old 10-16-2017, 09:58 PM   #4
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315 all tires.

Bob, Pat and Daisylee the JackABee
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Old 10-16-2017, 10:01 PM   #5
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Still very close numbers to use until you get weighed. I had the 315s last year and ran 100, have the 365s this year and run 110 because the chart calls for 105 so I add a little and didn’t notice the difference in the ride.
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Old 10-16-2017, 10:06 PM   #6
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We were weighed before the front axle upgrade and at 130 on hot tires we were at 150 and rode like a rock. I'll keep them at 115 and not listen to the wife about the ride. We were really rattling home from Newmar. I'll take a chance at blow out over shaking apart. We even adjusted the ride height.

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Old 10-16-2017, 10:13 PM   #7
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I did factory pickup on the 2017 and they had 130 all the way around. I told them I wasn’t taking it after the first ride. They adjusted them quickly.

It’s a long way to get over the 85 in the rears, so the fronts are the concern.
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Old 10-16-2017, 10:15 PM   #8
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I run 95 on drive and Tag. 110 on steer.
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Old 10-16-2017, 10:59 PM   #9
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Those are excellent values to start with. Do you have the 365s up front or 315s?
I have 365s up front on a Spartan chassis. Really appreciate all the suggestions.
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Old 10-16-2017, 11:42 PM   #10
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allworths- if you have 365/70 R 22.5 LR L (load range L= 24 ply) tires you can carry 9,480#/tire (18,960# front axle) @ 110 psi inflation pressure & 10,200#/tire (20,400# front axle) @ 120 psi. Don't you only have an 18,000# front axle on your DSDP chassis??

I have a 20,000# front axle on my MADP- I've had it weighed by each wheel & only need 100 psi (includes a 10% added safety factor to each front tire actual weights & I only need 100 psi to cover my loads. I realize & understand Newmar has the DSDP heavy in the front, but find it hard to believe your front total axle weight exceeds 20,000#? You can have the front axle weigh at most truck stops or a grain elevator. Get it weighed ASAP!

I would run 115 psi in each front tire until you can have each wheel weighed. Newmar sets them at the factory @130 psi to CTA, not knowing how much additional weight the customer is going to put in the coach.

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Old 10-17-2017, 12:33 AM   #11
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Quote:
Originally Posted by allworths View Post
We picked up our 2017 DSDP 4369 the end of June and haven't found the time or place to have it weighed yet to help determine the correct tire pressures we should be running. I'm just curious what others with the same coach are running in their tires to help me determine a baseline to use until I can get it properly weighed. I've tried searching on this topic and the only pressure recommendation I could find was 85 psi on all the rears and 110 on the steer axle. Thanks in advance for your suggestions.


If you call Newmar customer service with your unit number they will provide you with the weight slip as it left the factory. You can then apply these to the tire chart as a starting point. As other have said maybe add 10% as a safety margin.
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Old 10-17-2017, 03:53 AM   #12
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Quote:
Originally Posted by allworths View Post
We picked up our 2017 DSDP 4369 the end of June and haven't found the time or place to have it weighed yet to help determine the correct tire pressures we should be running. I'm just curious what others with the same coach are running in their tires to help me determine a baseline to use until I can get it properly weighed. I've tried searching on this topic and the only pressure recommendation I could find was 85 psi on all the rears and 110 on the steer axle. Thanks in advance for your suggestions.
I agree with other advice to call Newmar and have them recommend a pressure based on the weight certificate and specific tires. You could load it up for a typical trip including water and fuel, plus toad, and make an appointment to go 80 miles up to Livingston TX where the Escapees HQ is, and have it and your toad corner weighed and assessed for your specific load and tires. Cost is $45 for coach and $10 for toad. More details are found at: https://www.escapees.com/knowledge/smartweigh
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Old 10-17-2017, 10:06 AM   #13
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After you load the coach with your "stuff" & full water (between fresh, grey & black adds up to full fresh) & fuel, have a four corner weigh done.

We had it done by service at the factory & on our 2017 DS4369, we run 110 front (365s front) & 85 rear & tag.
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Old 10-17-2017, 11:37 AM   #14
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Allworths, we picked up our 2017 DS 4369 in June with a factory pickup. Did two runs through the scales. 110# on the front (365's) and 85 in the rear did it for us. Our stuff was in the basement, full water, full fuel and the two of us in the seats. Side to side weights were within 200# on each axle.
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