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Old 02-18-2012, 07:42 PM   #1
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Tire Pressure

Should the tire pressure in the rear duals be the same or would there ever be a reason to run different pressure in each? The reason for this question is our coach which we have had for a week had a difference of 35lbs between the the duals on the same side?
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Old 02-18-2012, 07:52 PM   #2
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I am certainly no expert, but everything I have read says both dual tires should be the same pressure and both sides (all four tires) should be the same pressure. In order to find what that pressure should be, get your coach weighed on four corners if you can or by axle if that is all that is available. Use the weight/pressure chart from your tire manufacturer to determine what that pressure should be.
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Old 02-18-2012, 08:13 PM   #3
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Quote:
Originally Posted by jzick View Post
I am certainly no expert, but everything I have read says both dual tires should be the same pressure and both sides (all four tires) should be the same pressure. In order to find what that pressure should be, get your coach weighed on four corners if you can or by axle if that is all that is available. Use the weight/pressure chart from your tire manufacturer to determine what that pressure should be.
^^I agree^^
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Old 02-18-2012, 08:51 PM   #4
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Same tire pressure on each end of the axel depending on weight. Your fronts can be aired less or more depending on weight---but still the same on each end of the steer axel.
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Old 02-18-2012, 09:00 PM   #5
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Like others have said. It can differ front to rear but should be the same side to side for all tiresom an axle.
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Old 02-18-2012, 09:51 PM   #6
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No question about it the dual tires should have the same pressure. To not have the same pressure the outside diameter would be different and that is a no no on duals. They may scuff the surface.
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Old 02-18-2012, 09:59 PM   #7
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So the why?

Dual inner and outer MUST be equal or the more inflated tire could easily carry OVER it's design weight because that higher inflated tire is carrying more load. That's a forumla for disaster - even if the overload is still within spec as the dual is no longer performing as a "dual" combination due to the pressure imbalance. Dual tire size/diameter matching is also very important.

Side = side on same axle in order to maintain similar tire handling characteristics between left and right turns for obvious safety reasons.

Hence if when you weigh each corner the axle side to side weights are different, set the TP on both sides (and inner/outer) of the same axle to the higher weighted side.
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Old 02-18-2012, 10:49 PM   #8
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Thanks for the input. I thought the same thing, I can't understand how the tire pressure was so far off, the same on both sides.
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Old 02-19-2012, 01:37 PM   #9
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[QUOTE=cokeinator;1087759]Thanks for the input. I thought the same thing, I can't understand how the tire pressure was so far off, the same on both sides.[/QUOTE]

Yeah, I agree...that's quite a spread in pressure. Could be for a number of reasons. Nails, leaking valve stems/extensions...just bring all tires up to the correct pressure and keep a watchful eye on the pressures. If the loss continues, seek help from a good tire dealer. Bob
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Old 02-20-2012, 11:10 AM   #10
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Are the tires the same make/model/size, and age?


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Old 02-22-2012, 08:58 AM   #11
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Yes, I went to the Goodyear website to get the inflation #. Front 111lb and rear 90 for all.
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Old 02-25-2012, 11:47 AM   #12
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I found pressure information on a spec sheet located in the cab over the drivers' seat. 95 psi in the front and 90 psi for the duals.
2008 Damon with Workhorse Chassis.
Anyone have info on valve extenders. I'm thinking about having some installed.
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Old 02-25-2012, 11:58 AM   #13
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Instead of valve extensions, install a crossfire system. A little more, but it equalizes pressure in both tires and you can check pressure by just walking by and checking the guage.
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Old 02-25-2012, 12:32 PM   #14
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Quote:
Originally Posted by ElCajonee View Post
I found pressure information on a spec sheet located in the cab over the drivers' seat. 95 psi in the front and 90 psi for the duals.
2008 Damon with Workhorse Chassis.
Anyone have info on valve extenders. I'm thinking about having some installed.
Thanks, for steering me on the right track, re pressure symmetry side-to-side. That's a good gotcha, one is tempted to look at the axle-end weight notation in the inflation charts and concur that they could be independent. But, Michelin specifically says to never get that precise HERE.

I'll assume they want us to use the higher of the two axle-end weights, when going into the inflation table.


El Cajonee mentioned using the sticker by the driver's seat. Offthewall answers this issue best, in an earlier post:
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.
He didn't mention that chances are, the tires on your coach aren't even the same tires used to come up with the stickers' numbers.

Indeed, the only correct way to find inflation values is to get an axle-end weight and then use the manufacturer's data for the tires on the coach at present.

Hey, I fell for that one, too; until some nice person here put a bug in my ear. Thanks, iRV2!!
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