t6tpoli
Arizona
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Joined: 03/02/2012
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I recently purchased a 2005 diesel Newmar Dutchstar. It has the spartan mountain master 4 airbag chassis. The ride is great, and it handles very well. It's very smooth and quite along good roads. It does however get a little rattled along rough (concrete) highways. This is my 1st diesel rig, and I'm wondering if that is normal for this kind of chassis?? I replaced the original tires with new Hancook's, and am running (100 psi), which seems correct for the rigs weight...could that be to high?
Any thoughts would help..
Newbie Tim
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Tom/Barb
Oak Harbor
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Joined: 10/16/2009
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our Newmar rattles a little on rough roads but it is the coach, not the chassis.
Tire pressures ---- I run 115 at 27,000# gross with Michelin 22.5" X10" motor home tires.
2000 Newmar mountain aire 4081 DP, ISC/350 Allison 6 speed, Wrangler JK toad.
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supercub
Modesto CA
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Joined: 04/24/2005
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I have an 05 Fleetwood Revolution LE 40E on a Spartan Chasis and it rides very nicely. Has the nicest ride of any motorhome I've driven. It grosses at 34000 lbs. I had it weighed and checked the tire pressure charts and I run 100 PSI. I have I have 295x85?x22.5. Keep in mind the length of the wheel base, the tire size will effect the ride. Here in central CA we have some of the worse roads around, my Spartan Chasis rides as good as my car and handles great.
Brian
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Bruce Brown
Northern NY
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Joined: 06/01/2001
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As good as a diesel chassis is a rough road is a rough road. Couple that with 100 PSI (or more) in your tires and the law of physics takes over. Something has to give.
Lowering your air pressure will help, but at the cost of running at an unsafe air pressure.
There are 24 hours in every day - it all depends on how you choose to use them.
Bruce & Jill Brown
2008 Kountry Star Pusher 3910
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barnaclebill
Atlanta Michigan or towards the sun
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Joined: 03/09/2005
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I also have a Spartan M/M chassis and replaced the shocks (Bilstein)at 6 years old and 45K miles and it made a HUGE difference but rough roads can still jar us. I got them from Spartan, they had the best price. I hope this helps, Bill
2003 41' Newmar Mountain Aire
400 Cummins
Jeep Liberty
Blue Ox Brake Buddy
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jdocter7
Illinois
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We have an '06 Newmar Dutchstar on a Spartan Moutainmaster. Talked to Spartan and replaced front shocks with Konis--improved our ride remarkably!
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deandec
Northern CA
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Joined: 09/26/2001
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Quote:I replaced the original tires with new Hancook's, and am running (100 psi), which seems correct for the rigs weight...could that be to high?
It is difficult to answer that question with the facts given.
The usual procedure is to determine the load your tire is carrying by getting the axle weights of your rig at a weight scale.
Then use the tire manufacturer's chart of tire size, weight carried, and determine the air pressure recommended.
Dean
95 CC Magna, Jeep GC
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jadatis
Holland
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Joined: 12/20/2009
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In addition to the former post of deandec.
From the tires you need the next "maximum load Single/Dual xxxx lbs AT yyy psi(cold)" And try to get an European list of loadcapacity for pressure, they are made with saver formula then still is used in America.
Even American tires you can calculate with the European formula.
If you want I can give here a spreadsheet where you can make your own list with the formula you trust.
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