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Old 10-13-2014, 05:18 PM   #1
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Tire Pressure

We have heard so many suggestions on tire pressure to run on our new rig, I thought I would ask your opinion. We have a 4369 Newmar Dutch Star with 315, 80R 22,5 tires. The manufacturer recommends 135lbs. We think this is high. What do you think?

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Old 10-13-2014, 05:25 PM   #2
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A belated

Glad you're aboard. IMO Most will tell you to get the four corner weight of the coach and adjust your tire pressure using the inflation table for your brand and size of tire for the weight. Enjoy your adventures and be safe.

Have a wonderful day!
Ken (RVM 87)
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Old 10-13-2014, 05:27 PM   #3
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1) There are many threads on this forum about tire pressure, and 2) you will get a lot of responses.

In general the majority of responses will state to get your new to you coach weighed then use the tire manufacturers chart to determine the correct tire pressure.

Most RV manufacturers will have a piece of paper mounted in the coach stating their tire pressure recommendations which is based on their gross vehicle or gross axle weight ratings which will be fine, until you can get it weighed. Me I just go with theirs.

Welcome aboard!
Tom Wilds
Blythewood SC
2016 Newmar Bay Star Sport 3004
2015 Jeep Wrangler 2DR 4WD Sahara, Automatic, Hard Top
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Old 10-13-2014, 05:44 PM   #4
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Hi JayBee49,
It is really high. Do you have the Newmar recommendation (135 PSI) in writing? Look at it this way if you are at GAWR for each of your axles the Michelin PSI recommendation is:
Drive axle is 20K lbs GAWR. This means 85 PSI
Tag is 10K lbs GAWR. This means 85 PSI
Steer is 17K lbs GAWR. This means 125 PSI

I doubt you are at GAWR. It is possible, but I doubt it. Consider having the coach four corner weighed after you load it for travel. Newmar should have done this and the weight should be on one of the stickers inside one of the cupboard doors. That weight is with a full fuel tank but nothing else. Anything you add (like fresh water, propane, your stuff and people must be taken into consideration).

The minimum PSI Michelin recommends for your tires regardless of weight is 85 PSI. On the sidewall of the tire, there should be a maximum PSI stamped on the tire. For your tires this is:
9090 lbs = 130 PSI for single
8270 lbs = 130 PSI for dual
This is the weight on each tire.

Go to the Michelin RV tire chart at Michelin North America RV Load & Inflation Tables and download the inflation table.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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Old 10-13-2014, 10:50 PM   #5
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I agree with Gary and table he provided, in fact the Owners Guide has a good write up on your tire pressures.
When they ship new coach's they fill to sidewall pressures which will have to be changed after you have your coach weight and will give you a better ride.
Congratulations on new coach and welcome to the Newmar family and irv2.
In my signature below are links to many others for info for your coach.
Safe travels.
98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans
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Old 10-14-2014, 01:50 AM   #6
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Made a pressure/loadcapacity list for the 315/80R22.6 with my made formula wich is saver even then the formula used by Michellin , wich is in its turn better then the most American lists.
Here a picture of it.

Can not get the picture working so atached it , also not ideal.
then you have to know , as long as you did not weigh, the GAWR's , number of axles and number of tires on each axle.
this is minimum needed , but next is also handy .
From tires the maximum allowed speed given in a letter From J to Q ( probably M or N) . From RV GVWR .
If you give all that , I will fill it in my Motorhome or Travel-trailer tire pressure calculator.

Greatings from a Dutch self declared tirepressure specialist
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