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Old 09-14-2019, 08:13 AM   #1
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295/80R22.5 tires

Hi, all this is Michbill,
I know this is a well-worn topic but, I am back looking at new tires for our 2009 Monaco Dynasty Regal IV.
On Sat. 09/07/2019, I had the driverís side steer tire blow while doing 60+ MPH on I-69 in western MI. Luckily, I was quickly able to drive to the shoulder despite initially being pulled partway into the hammer lane. Although there is damage to the coach, the outcome could have been very much worst!
I donít know the cause of the blowout. However, I did find a 3íX3/4Ē X1/4Ē flat steel rod embedded in the undercarriage of my tow vehicle. I donít know if that caused the MH flat or if it came off the MH fender when the tire blew.
The tires on the coach are Michelin 295/80R22.5 XZA2 Energy 152M LRH. They were/are about eight years old. I have looked on FMCA, and they list three different Michelin 295/R8022.5ís:
1. XZA2 Energy 152M LRH
2. X COACH HLZ,
3. X MULTIWAY 3D XZE LRH.
The prices are also different:
XZA2 Energy 152M LRH, $671.67
X COACH HLZ, $750.65,
X MULTIWAY 3D XZE LRH 787.38
Can anyone help explain what the difference is between the three? I called Michelin, but the person that answered could not.
Despite the difference in cost between Michelin and others, previously I looked at the Continental and Toyo, I am going to stay with Michelin.



As always thank you all very much! Bill
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Old 09-14-2019, 10:48 AM   #2
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Bill,

I can't give a lot of help, but do you have a dealer in mind to buy the tires? If you do, I'd ask them. Some of these guys really do know their stuff, some not so much.

And I do encourage you to post what you learn.
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Old 09-14-2019, 10:58 AM   #3
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Most times the differences are in tread design and the tire's intended use.

Example .
Steer axle vs drive axle .
or All position vs. Traction; that would be laid out in the tire specifications.

I'll take the info you've posted and see if I can clear things up for you .


EDIT: OK from the Michelin RV tire brochure ; that's too big to post here in the forums .
XZA2 Energy , all position tire rated at 7830 lbs @ 123 psi single.

XCOACH HLZ , all position rated at 8270 lbs @ 123 psi single ; so basically a higher load rating than the XZA2 Energy

X Mutiway 3D XZE LRH. All position rated at 7830 lbs @ 123 psi , but described in the text as having a design to give a 2% increase in fuel economy .

I spent over a year looking for tires for my coach , because I drive in snow, in Oct & Mar , and traction tires are mandatory in those months here in BC.
I ended up with Yokohama's because Michelin didn't offer traction tires in my 275/70R22.5 size.

So depending on your load , and if you consider a possible 2% increase in fuel economy worth the extra, any of the three will do for your coach.
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Old 09-14-2019, 11:08 AM   #4
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Michelin has a commercial tire selection chart on their web site. Work through the selections and it will display the various tires available with a good description of each model.
I've personally used the XZA2 Energy and the X Line Energy Z coach tires with good success. I would avoid the XRV tire has many folks have had sidewall cracking issues.
https://www.michelintruck.com/tires-...B&gclsrc=aw.ds

A side note, Monaco began installing one size larger 315/80-R22.5 tires on the front of the large diesel coaches in 2009. I'm surprised your coach does not have them. The larger tire has a higher load capacity and allows a lower tire pressure which results in a smoother ride. Ideally, these should be used with a slightly wider wheel (9" vs 8.25") but I've installed them on two different coaches with the 8.25" wide wheel with good results. You and your passenger will instantly notice the smoother ride.

Many of us on this forum have installed the 315 front tire without issue. One member with an 08 Navigator (same RR10S chassis) had a clearance issue on the passenger side.
If you decide to go with the 315 front tire, mount the passenger side first and check for clearance with the coach at ride height. Make sure you turn the wheel from lock to lock.
Best of luck!
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Old 09-14-2019, 11:26 PM   #5
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Last week I got my second set of Michelin 295/80R22.5 XZA2 Energy through FMCA and they are fresh, 2 months old.
I went back and got my tires and sold them for $600 because they only had 18k miles on them and 6 years old.
Good that you keep it under control and made it to the shoulder.
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Old 09-15-2019, 05:45 AM   #6
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Unless your set on Michelin tires, take a look at the Toyo M144. About half the price and have same load rating. I have not run these tires but read about a lot of happy user of that tire on this forum.
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Old 09-15-2019, 07:02 AM   #7
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8 years old, wow. I have had both the XZA2, and the X Coach HLZ in 295/80R22.5 on our coach, both had bad sidewall cracking at 3 1/2 years. It swore me off Michelin forever. We went to Toyo M144 as a previous poster mentioned, the ride, we both, my wife and I think is smoother, the handling is excellent, and the price is much, much better. We also were unable to put 315/80R22.5 on our front because of clearance issues.
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Old 09-15-2019, 07:40 AM   #8
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Thank you all.
Vito, my coach, was built in mid-2008. That may be why it came with Goodyear 295's that the original owner changed for Michelin.

I have additional questions raised by your reply:
1. Other than physically trying the tire, how can I tell if the 315 will fit?
2. Do you put the 315 in all positions or just the front?
3. If only the front doesn't that make the coach higher in the front, then the drive/tag putting more weight on those?

4. I know that the 295 or 315 is the height of the tire but what unit of measure?

Thank you
Bill
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Old 09-15-2019, 07:44 AM   #9
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295 is the width, in MM.
/80 is the percentage of the width that is the sidewall height. So 2*295*.8+rim diameter(in MM) is the diameter of the tire.
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Old 09-15-2019, 08:49 AM   #10
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The 315/80R22.5 fits on a 9.00" and 9.75" wide wheel, while the 295/80R22.5 fits on a 8.25" and 9.00" wide wheel.

For the three tire options, the most common for the 295/80R22.5 is the Energy XZA2 (16/32"). Is your motorhome near the weight limits of the tires?

Like mentioned, the X Coach HL Z (18/32") has a higher load carrying capacity and has "Infinicoil" technology, which is a single cable wrapped circumferentially around the tread area. It provides the greater load carrying capacity and a better footprint for even wear.



The third option, the X Multiway 3D XZE, would be my third choice. It has the deepest tread depth (19/32") is directional, and carries the same load as the XZA2 Energy.

All of these tires are made in Europe, so the DOT dates are not normally within weeks of production. The 7 year tire warranty starts on the date of installation to the original consumer. Sidewall cracking is now covered under the Michelin warranty (changed in 2016). Hope this helps.
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Old 09-15-2019, 10:51 PM   #11
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Quote:
Originally Posted by Michbill View Post
Thank you all.
Vito, my coach, was built in mid-2008. That may be why it came with Goodyear 295's that the original owner changed for Michelin.

I have additional questions raised by your reply:
1. Other than physically trying the tire, how can I tell if the 315 will fit?
2. Do you put the 315 in all positions or just the front?
3. If only the front doesn't that make the coach higher in the front, then the drive/tag putting more weight on those?

4. I know that the 295 or 315 is the height of the tire but what unit of measure?
Thank you
Bill
1. Turn your steering wheel on your current 295 tire so that the tire is closest to the air bag mount and measure the clearance. This should be done at ride height in travel mode on both sides, but pay particular attention to the passenger side. The 315 tire is about 1.2" taller (.6" in ride height). If you have 2-4" clearance like our last two coaches, then it should fit no problem.
I helped a friend last year that said they wouldn't fit his coach, but his coach was not at ride height. In travel mode they cleared just fine.

2. No. Just the front.

3. I've weighed my coach many times and there is no change to the load. You can easily adjust the rear ride height if you think it's necessary. You can also adjust the tag axle air bag pressure to change the front-rear loading. On my coaches you could not tell the difference visually.

4. Like above, 295 and 315 are the tire width in millimeters. These are 80 series tires so the height is 80% of the width x2 plus the rim diameter.

The 295 is a 16 ply tire and the 315 is a 20 ply tire. I reduce the front tire pressure from 115psi to 105psi.

With a search you will find several discussions on this subject. Some of the folks that have not tried it are against it. All of us that have tried it like it. Even some of the Camelot owners have gone this direction. The clincher is Monaco began installing 315 front tires on these large diesel coaches from the factory in 2009. Mike Canter (used to be a Moderator on this forum) first told me about this. We immediately noticed the large jolt on bridge abutments was softened.

If you look at the other manufacturers large diesel coaches you will see most of them switched to 315 front tires around 2009 and now are going up to 365 front tires in the last few years.
Hope this helps.
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Old 09-16-2019, 06:05 AM   #12
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A few questions:
  1. I've heard, and seen it posted, that the 315's fit fine on the Exec and Sigs but there's a clearance problem with Dynastys... at least the earlier 2000's coaches. Is there any validity to this? Are there Dynasty owners out there with 315's up front? If so do you use the 8.25" wheels or the 9.0"
  2. Toyo load-inflation tables show multiple lines for 315/80R22.5 (see below). Which of the lines is for the 315 size of the M144?
  3. Michelin load inflation tables show higher weight carrying for same inflation pressure.
    • For example, to carry 7100 lb at each front wheel position, the tables below show the '315' Michelin XZU-S2 needs 85 psi and the other 315 Michelins need slightly less than 100psi.
    • However one of lines for the Toyo 315's specifies slightly less than 95 psi and the other 100psi.


Toyo:


https://www.toyotires.com/media/2155...ion_tables.pdf

Michelin:


https://www.michelintruck.com/refere...tion-tables/#/
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Old 09-16-2019, 12:24 PM   #13
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I am running Conti Coach 315's on 8.25 on our 04 Dynasty @ 115 lbs

Toyo M144 295's on the rear @ 95 and 90 tag.

No issues except slight rub on steering link on hard lock Right turn.
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Old 09-16-2019, 07:56 PM   #14
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Quote:
Originally Posted by Burgy View Post
I am running Conti Coach 315's on 8.25 on our 04 Dynasty @ 115 lbs

Toyo M144 295's on the rear @ 95 and 90 tag.

No issues except slight rub on steering link on hard lock Right turn.
That is information I needed to know, thank you.
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