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Old 08-09-2010, 09:05 AM   #1
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Another tire pressure ?

New rig... got new rig weighted at Cat scale, I know not as good as each wheel position but until then... Here's what I got

Michelin tires

Front 13960 lbs 305/70R22.5

Rear 16800 lbs 295/80R22.5

Tag 8160 lbs 295/80R22.5

I was on individual sections on the scale when weighted. Since this is our first with tag not sure I understand the difference in weights between the rear and tag, why aren't they similar? Looking at the chart looks like I need 120lbs pressure on the front (which is where it is at currently). Not sure about the rear and tag tires. Any advice would be appreciated. By the way this is our fully loaded, ready to travel, weight.

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RonK

2011 Fleetwood Revolution LE 42W
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Old 08-09-2010, 07:44 PM   #2
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I am no expert, but I would put the maximum pressure in all of your tires so they are all even. I think those back tires can all go to 120lbs too but you can chech the sidewall for the number.

My coach has a tag axle as well. The weight on mine is not as much as yours, but the principle is the same. My tires are all the same so it is a bit easier for me.

The weights you have measured are the downward forces on each axle. What you have founding is the revolution's tag axle supports about half the weight of the main rear axle. This is done by design. The rev is quite heavy, so tire pressure is very important for a lot of reasons, not the least of which is safety.

Talons
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Old 08-09-2010, 08:07 PM   #3
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Ronk,

The pressures should be different as each axle is carrying different weight. Look at pressure chart for the Michelins you have. Your weights aren't far from mine and the recommended pressure is 115 for the front, 85 for the dual rear and 80 for the tag. Each tire on 2 rear axles carry about the same weight and that's why they are close to the same. Again, check the Michelin chart.

The tag axle is typically adjustable. I suspect most manufacturers recommend they be set for about 10,000 lbs. That's the recommendation for my Beaver.

BTW, what is the maximum front axle weight rating on your coach?

Gil
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Old 08-10-2010, 08:26 AM   #4
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Gil:

Just took the weights off the label inside the coach, here's what I found which will answer you question....


Front : 14600 lbs

Rear : 20000 lbs

Tag : 10000 lbs


sooo, from the Michelin charts here's what I'm reading..

Air pressures

Front : 120 lbs

Rear : 75 lbs but I'm set at 90 lbs

Tag : 75 lbs but I'm set at 80 lbs

I will say that the ride at the current settings is fantastic, more like a Lincoln Continental ride. I do notice at times a slight, gentle, proposing on the front if we are on a hi-way with "waves".
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Old 08-10-2010, 06:42 PM   #5
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Just be careful about UNDER inflation as that is what causes most blowouts.

My rig weighs 17,290 lbs empty and is rated for 20,000 and 25,000 gcvw.

Each tire provides some of the load carrying ability of the chassis to support the coach.

Your coach weighs over 30,000 lbs, so it makes perfect sense that the front carries almost half of this weight.

The tag axle is there to help the frame with the extra load (mine is not adjustable that I know of) and helps to provide that smooth ride.

I love our MH and would be hard pressed to go without the tag.

Good Luck,
Talons
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Old 08-11-2010, 10:32 AM   #6
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Just My rig weighs 17,290 lbs empty and is rated for 20,000 and 25,000 gcvw...I love our MH and would be hard pressed to go without the tag.
Do you really have a tag axle? I would be surprised that at 25,000GCVW anyone would go to the expense on another axle.

Gil
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Old 08-11-2010, 11:56 AM   #7
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Do you really have a tag axle? I would be surprised that at 25,000GCVW anyone would go to the expense on another axle.

Gil

He probly does, most 90's era National coaches over 35' had tags.

Glenn
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Old 08-11-2010, 03:42 PM   #8
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Quote:
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Do you really have a tag axle? I would be surprised that at 25,000GCVW anyone would go to the expense on another axle.

Gil
1997 National Dolphin 535.
Thanks, Glenn.

Talons
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Old 08-12-2010, 07:41 PM   #9
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Quote:
Originally Posted by RonK View Post
Gil:

Just took the weights off the label inside the coach, here's what I found which will answer you question....


Front : 14600 lbs

Rear : 20000 lbs

Tag : 10000 lbs


sooo, from the Michelin charts here's what I'm reading..

Air pressures

Front : 120 lbs

Rear : 75 lbs but I'm set at 90 lbs

Tag : 75 lbs but I'm set at 80 lbs

I will say that the ride at the current settings is fantastic, more like a Lincoln Continental ride. I do notice at times a slight, gentle, proposing on the front if we are on a hi-way with "waves".
Ronk, If you're happy with ride, leave the pressure as is and roll it on down the road. You're well within the minimums. Happy travels.
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