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Old 09-12-2016, 09:07 AM   #1
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Tag Axle tire wear?

I replaced my tires 2 years ago and have since put 30K miles on the coach. I'm fairly meticulous about checking pressure. I keep the tag at 105.

My coach is an 08 Magna and the nylon is separating underneath the tread. This is only happening on the tag axle and it looks identical on both sides of the coach.

Any idea why this might be happening?
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Old 09-12-2016, 09:42 AM   #2
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Quote:
Originally Posted by wrtundra View Post
I replaced my tires 2 years ago and have since put 30K miles on the coach. I'm fairly meticulous about checking pressure. I keep the tag at 105.



My coach is an 08 Magna and the nylon is separating underneath the tread. This is only happening on the tag axle and it looks identical on both sides of the coach.



Any idea why this might be happening?

Not sure about the problem. I doubt that there is any nylon in that tire. Can you describe what you see?
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Old 09-12-2016, 09:48 AM   #3
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Is the tire tread starting to delaminate? Pictures would help.

IMO 105 seems high for pressure in a tag but my experience is with a lighter coach.
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Old 09-12-2016, 09:55 AM   #4
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Originally Posted by Gordon Dewald View Post

IMO 105 seems high for pressure in a tag but my experience is with a lighter coach.
I was thinking the same, but a Magna may have a 15,000 lb tag axle.

Regardless, 105 psi shouldn't damage the tires.
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Old 09-12-2016, 09:58 AM   #5
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If the tag bag pressure is low the tag tires could be scuffing.
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Old 09-12-2016, 12:37 PM   #6
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Quote:
Originally Posted by wrtundra View Post
I replaced my tires 2 years ago and have since put 30K miles on the coach. I'm fairly meticulous about checking pressure. I keep the tag at 105.

My coach is an 08 Magna and the nylon is separating underneath the tread. This is only happening on the tag axle and it looks identical on both sides of the coach.

Any idea why this might be happening?
Sounds like the result of sharp turns/maneuvering without the tag axle being elevated. The tire sticker in my 48,500 GVWR suggests a tag tire pressure of 115 PSI. GAWR of 11,000 pounds on our tag axle.

Maybe a little higher pressure in yours would help resist the tendency of the sidewalls to "fold" when being "dragged" sideways in sharp turns if the tag axle is not raised.

FWIW
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Old 09-12-2016, 04:41 PM   #7
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Not sure about the problem. I doubt that there is any nylon in that tire. Can you describe what you see?
Yep, should only be steel belts, cords in those tires if Michelins.
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Old 09-12-2016, 04:43 PM   #8
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Originally Posted by 96 Wideglide View Post
I was thinking the same, but a Magna may have a 15,000 lb tag axle.

Regardless, 105 psi shouldn't damage the tires.
Ours is one of the later ones and the tag is a 14,000# unit with the 365/70 tires.
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Old 09-12-2016, 04:48 PM   #9
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Tag Axle tire wear?

I would quickly check the gauge on the tag bags when idling and pressured up. Low pressure equals tag drag
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Old 09-13-2016, 09:46 AM   #10
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Ours is one of the later ones and the tag is a 14,000# unit with the 365/70 tires.
Out of curiosity and the need to know what does your loaded tag weigh? And what pressure do you have in the tires?

Just thinking about things is it possible that the tire pressure is high the tag bag pressure is low and the tag is skidding during turns? That could lead to the center of the tire prematurely wearing and the cord showing. Really guessing on this one at a full stretch.
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Old 09-15-2016, 06:59 PM   #11
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A lot of incorrect answers on here. First the more air you put in the air bags on the tag, the more weight transfer to the tag from the drive. No such thing as " tag drag " with less air. I run 12R 22.5s at 105psi max. You can determine how much wt. needs to be on the tag based on your drive wt. on the ground.

Now , it sounds like you have a bad run out on the tag axle. Look for warn bushings, shocks , and the worst thing is a cracked frame assembly which was common on early chassis built by Country Coach. If you have a cracked frame where it joins the tag axle about the only fix is new tag assembly. What will happen at some point the tag axle stubs on one side, usually the pass side, will actually brake away and turn several degrees out word. The first thing you will notice is all the tread cap will come off . You may not have this problem, it's costly to replace , around 10,000 with tires. First thing I would do is have a shop pull the wheels and check for any cracks ...my guess you will find some. Now, much of what I have said is a result of my own CCConcept failure. I have the Gillig chassis which is very heavy duty thick rails, weak point is the tag . When they installed mine the whole new axle was installed, aligned and then the center section axle tube was cut away. Not all set ups are like mine so some words of correction may apply if you have the DynaMax chassis.
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Old 09-15-2016, 07:43 PM   #12
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Tag Axle tire wear?

Physics tells me that increased tag air bag pressure will take some weight from the drive axel, and the drive axel will be a fulcrum to leverage more weight to the steer axel.
My curiosity is still with the tag air bag pressure. But the axel alignments can be in question
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Old 09-15-2016, 07:54 PM   #13
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Physics tells me that increased tag air bag pressure will take some weight from the drive axel, which will be a fulcrum to leverage more weight to the steer axel.
My curiosity is still with the tag air bag pressure. But the axel alignments can be in question
You can take a lot of wt. from the drive, too much depending.and , put a lot of wt on drive. Very little change on steer, not enough to mean much.. Semi trailers , especially those with a 10'1" spread often have a dump valve installed in the tractor. ( not legal in all states )
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Old 09-15-2016, 08:59 PM   #14
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Just to give some insight.
On my rig the weight is 17500 front 20750 drive and 10500 tag.
I can raise the tag regulator and increase the weight held by the tag and it will reduce the drive weight but will increase the steer weight also.
When I raise the tag off the ground the drive weight goes to 32000 and the front comes down 16750. This is due to increasing the rear overhang and changing the wheelbase. I use the pressure to manage the weight I can tolerate on the steer. Its a delicate balance with loads at the top end of spec.
Not sure what the original posters problem is. Without pictures ,tire sizes ect . I got nothing.
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