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Old 06-17-2018, 07:58 PM   #1
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Tag Axle Tires on 2016 Grand Tour Are Showing Excessive Wear

Just returned from a 400 mile weekend round trip. When I checked the the tires the tag axle tires seem to be wearing excessively - see pictures comparing the tags with the dual drive tires. The tags almost look that they are getting too hot and melting. I'm running 105lbs in the tags. The drive tire treads look "crisp" where the tags don't. Notice that the tags look almost swollen with the middle tread looks all scuffed.


Any comments or help to diagnose?
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Old 06-17-2018, 08:01 PM   #2
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What chassis? There are known problems with some of the steerable tags as well as some of the liftable ones being out of alignment right from the factory.
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Old 06-17-2018, 08:03 PM   #3
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Chassis is Freightliner Maxum Chassis
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Old 06-17-2018, 08:05 PM   #4
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Also the chassis is non-steerable.
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Old 06-17-2018, 08:06 PM   #5
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make that non-steerable tag..
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Old 06-17-2018, 09:11 PM   #6
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Obviously I don't know your axle weights, but 105 psi seems a little high. Could the tag be carrying to much of the load? My Tour probably isn't as heavy as your Grand Tour, but my axle weights dictate 85 psi in the tag tires and 100psi in the drive tires.
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Old 06-17-2018, 10:47 PM   #7
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Quote:
Originally Posted by moleary View Post
Obviously I don't know your axle weights, but 105 psi seems a little high. Could the tag be carrying to much of the load? My Tour probably isn't as heavy as your Grand Tour, but my axle weights dictate 85 psi in the tag tires and 100psi in the drive tires.
My Tour is 105 in Drive and 95 in the tags. Based on my weights.

I don't show any unusual wear on either set. 26k miles
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Old 06-18-2018, 05:09 AM   #8
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Quote:
Originally Posted by akcretired View Post
My Tour is 105 in Drive and 95 in the tags. Based on my weights.

I don't show any unusual wear on either set. 26k miles
Thanks . let me find my paperwork of when I went to get weighed. I kind of remember being pretty heavy.
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Old 06-18-2018, 06:50 AM   #9
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On a side note, I carry less psi in the tags to help lessen the weight on the front axle. I believe Winnebago finally went with a heavier front axle in later years, but my 2012 front axle weight is nearly exceeds its weight rating.
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Old 06-18-2018, 05:24 PM   #10
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My tags show wear on the outside edge due to scrubbing on turns, other wise they are fine.
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Old 06-19-2018, 07:20 PM   #11
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I would agree with moleary's statmemnt that the tags may be carrying too much weight and pressure causing that wear when they scrub around corners. Would like to know what the axle weights are.
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Old 06-20-2018, 06:56 AM   #12
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My weight paperwork from the last time we weighed at a CAT scale is in the coach and we park the motorhome in storage lot. I'll go by this weekend and review it again. As I recall I was pretty close to the max weights for the Grand Tour.. aka my wife likes to bring along a lot of stuff.
Thanks for the responses.. I just don't want to be doing something wrong and then having to buy tires prematurely or even worse have a blowout.
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Old 06-24-2018, 10:25 AM   #13
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Well I retrieved my CAT weighing paperwork and it's attached. I just can't figure this out. As you can see from the paperwork the steer axle is 14700 (assuming 7350 x 2) and the rear is 30040 for a dual and tag configuration. My tires are Michelin XZA2 Energy 295/80x22.5 tire on a 2016 Grand Tour. When I look on the Michelin tire charts it shows the PSI should be 110 for the front and 120+ for the rear (if I'm reading it right). That seems high and I was running 110 front and 120 rear (and for the tags) and that seemed to be wearing the tags prematurely - see original pics in this post. I just don't want to over or under inflate. I've attached a pic of the scale report from when I weighed last year. We haven't change the config or load of the motorhome since that weighing.
Any help/advice on how I should be reading this info and adjusting pressure accordingly would be greatly appreciated.
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Old 06-24-2018, 10:28 AM   #14
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I should note that I couldn't easily get a individual weight for each tire or the separate tag because of the way the scale was set up with bumpers and other stuff in the way.
so this report is the best I could get.
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