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Old 05-20-2011, 07:12 PM   #1
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Tire pressure

What is the correct cold tire pressure for a 2009 Dutch Star 4086
Thanks
Simon
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Old 05-20-2011, 07:53 PM   #2
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Simon, what you need to do is get your coach weight at a Cat Scale or similar location with your coach ready for travel.
You will than go to the tire manufactures tire site with your Axel weights and add air to mfg's tire pressure table.
Tire pressures you see on sticker above drivers seat on wall are for unloaded weights.
To much air in tires can cause you a blowout your tires will increase in tire pressure as they heat up from 10-15 lb's.

Michelin tire information
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Old 05-20-2011, 08:09 PM   #3
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I have been around the table on this issue and finally decided to go with the Newmar suggested tire pressure on the tag next to the driver's seat and I haven't been disappointed in this decision so far! But, way beyond tire pressure - I want your coach! What a wonderful floor plan and coach you do have! You made a great choice! Enjoy it!

Barry
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Old 05-21-2011, 04:06 AM   #4
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Smile Newmar

Best layout Ive seen in any coach plus mine has huge upgrades factory and mine
Ive put full remote electric blinds through out, round glass table, put outsie mirrors upside down, remote control ceiling fan in bedroom, full length custom made mirror on fridge wall,changed every light fitting, light switch, added lights boy took me about 6 months to get it how I want it
regards
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Old 05-21-2011, 06:36 AM   #5
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What side is your drivers seat in that 40' motor home driving in the UK. or are you in the U.S.?
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Old 05-21-2011, 06:41 AM   #6
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Just to repeat stuff you probably know or have heard, but just in case you had not..At min do the cat scale weights for each axle. Even better and recommended is weighing each wheel..this is done for a minor fee at almost all major rallies. This should be done with the coach in normal driving trim and load...then with the tires cold adjust tire pressure to what the tire inflation tables say..I and some others add 5# for security in case of change in load...and do this at least once a year or as needed do to changes in stuff in the coach..
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Old 05-21-2011, 12:23 PM   #7
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So, a more basic question, how do you add air to the tires with the tires cold? I check the pressure in the morning at the site but to get to an air hose I have to drive to a station usually far enough away that the tires will heat up. As I understand it you should wait 2 hours to have them cool down. So do youall carry an air pump that is sufficient for RV tires in your coach or is there some other way I'm missing?
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Old 05-21-2011, 06:13 PM   #8
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Assuming a dsdp you should have an air fitting in the generator compartment not sure which type of quick disconnect...it may go to high enough pressure for front tires...My preferred way is to use a portable air compressor that uses AC power and goes up to 140#..mine was made by husky and cost about $100 or so at home depot a few years ago. To use the air on the coach you have to run motor and air compressor does not require engine to be running...your neighbors will appreciate the compressor..JMHO
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Old 05-21-2011, 06:25 PM   #9
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Quote:
Originally Posted by "007"
Simon, what you need to do is get your coach weight at a Cat Scale or similar location with your coach ready for travel.
You will than go to the tire manufactures tire site with your Axel weights and add air to mfg's tire pressure table.
Tire pressures you see on sticker above drivers seat on wall are for unloaded weights.
To much air in tires can cause you a blowout your tires will increase in tire pressure as they heat up from 10-15 lb's.

Michelin tire information
The door sticker pressures are for your MAXIMUM GVWR, not "unloaded" weights. The reason to get a weigh is that you most likely are not traveling at your max GVWR and you should put less pressure in the tires than the door sticker states. Without a coach weigh, the door sticker pressures are your best starting point, knowing that you are likely not at the GVWR and likely have a little too much air in the tires. There is no danger of a blowout from having the pressures set at the higher than needed door sticker values. What will be affected is handling and ride. Too much air for your actual weight will result in a non optimal contact patch and a rougher ride.
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Old 05-21-2011, 06:44 PM   #10
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Offthewall is correct except about overweight....many older Newmars were at or over front axle weight before putting much more than fuel in them so make sure you weigh coach
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Old 05-21-2011, 06:58 PM   #11
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Quote:
Originally Posted by clubmed98
Offthewall is correct except about overweight....many older Newmars were at or over front axle weight before putting much more than fuel in them so make sure you weigh coach
Did not know about the overweight from the factory of older newmars, that sounds dangerous.
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Old 05-21-2011, 06:59 PM   #12
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Check the tires cold, drive to the air station and check again. Subtract the hot from the cold and add that to your final fill. Now when it cools down check them again and you should be close. Or overfill when hot and recheck them when they cool off and let it down to where it should be.
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Old 05-21-2011, 07:25 PM   #13
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Have started using Nitrogen in my Tires.....less heat on the road and very stable in outside temps..
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Old 05-22-2011, 12:50 PM   #14
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Thanks for the input. I'll go with the cold/hot comparison until I can spring for a portable air compressor.
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