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Old 11-19-2019, 06:34 AM   #1
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Flat tire replaced, now what

This past Friday I has suffered a flat tire on my passenger side inner dual rear tire. And as fate would have it, there were no Michelin XRV 235/80/22.5 tires available. So they sent out a Toyo M154 245/75/22.5 to get me on my way. My existing Michelin tires have around 5000 miles on them.

So, my question is should I try to work a deal with the tire company and get a Michelin on there or is it really no big deal running the slightly different sized tires in a dual tire setup? They both have the exact PSI/Load ratings per the charts. The only difference is 3/8 in the width and diameter. On my drive home I watched the pressures and temps and they stayed very even as they increased together.

In my mind, it doesn't seem to be a big deal as when you consider they are under load they are probably almost identical.

Opinion? Facts? Would like to hear if anyone has experienced this and what the long term results were.

Thanks guys and gals!
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Old 11-19-2019, 07:07 AM   #2
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It's not just size but load capacity.

Tire man's website can be found here:
RV Tire Safety

His site has everything you want to know about tires.

Here’s a few articles from his site to get help you started:

Can you change the size of your tires
RV Tire Safety: replace tires

Minimum dual spacing
RV Tire Safety: Minimum Dual Spacing

How to replace a tire in a Dual Application
RV Tire Safety: Tandem
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Old 11-19-2019, 07:23 AM   #3
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All tires on the same axle must be the same size and load range. If it were me I would have three more Toyo's installed and be done with it. Did you hit something with the Michelin or did it just blow?
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Old 11-19-2019, 07:34 AM   #4
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….you mentioned having only 5k miles on the Michelins but how old are they--born on date? If new, you have an "investment" in the Michelins so I would be incline to match what you have. Wont suspect much wear on the other three but again, a new Michelin will have a slightly larger dia. Basic issue is that modest difference between duals will cause issue with wear, cross-loading, pressure, and maybe handling. On the other hand, don't let "perfect become the enemy of the good enough."
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Old 11-19-2019, 07:46 AM   #5
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Originally Posted by mrfix View Post
All tires on the same axle must be the same size and load range. If it were me I would have three more Toyo's installed and be done with it.
OR...

His coach is a 2019 so all his tires are going to be practically new so his DOT dates should be good. Check to make sure though. I'd just chalk up that one purchased Toyo as a way to get out of the mess he was in, and go buy one matching Mich. Now he's back to all Mich's and 3 of them will have 5K miles on them. IMO, should be OK then.

My 2 cents.
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Old 11-19-2019, 08:09 AM   #6
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OR...

His coach is a 2019 so all his tires are going to be practically new so his DOT dates should be good. Check to make sure though. I'd just chalk up that one purchased Toyo as a way to get out of the mess he was in, and go buy one matching Mich. Now he's back to all Mich's and 3 of them will have 5K miles on them. IMO, should be OK then.

My 2 cents.
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Old 11-19-2019, 08:17 AM   #7
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One way to avoid having the mis-matched tires on a dual position would be to move the Toyo, a VERY good tire IMO, to steer position. That will keep all Michelins on the rear axle, and I doubt if you will notice any difference in the steering. Even if you do, you could find another Michelin and keep the Toyo as an UN-mounted spare.
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Old 11-19-2019, 08:21 AM   #8
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I used to take any good tires off my class 8 tractor and run remaining life on the trailer.If you cannot get 2 tires the same diameter the smaller one will wear out considerable sooner than the larger one. It will generally have a lot of cupping wear.
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Old 11-19-2019, 08:25 AM   #9
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All tires on the same axle must be the same size and load range. If it were me I would have three more Toyo's installed and be done with it. Did you hit something with the Michelin or did it just blow?
Assuming your original tires were on both axles, buy one more Toyo (rather than three) and put them on the front axle. Move one of the front tires to the inner dual...

Cheapest way... rather than change all the tires on the rear axle.
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Old 11-19-2019, 08:27 AM   #10
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Quote:
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One way to avoid having the mis-matched tires on a dual position would be to move the Toyo, a VERY good tire IMO, to steer position. That will keep all Michelins on the rear axle, and I doubt if you will notice any difference in the steering. Even if you do, you could find another Michelin and keep the Toyo as an UN-mounted spare.
You should not mix tires on any axle.

As you do suggest (and I stated in a later response), buy one matching tire and put those on the front - moving one of the originals to the inner dual that was replaced...
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Old 11-19-2019, 08:44 AM   #11
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Just move the new Toyo to a front tire position and keep all Michelins with the same 5k wear together on the dual rear axles. The front axle tires don't need to be the same since they are 8ft apart and single.
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Old 11-19-2019, 10:10 AM   #12
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Agree with grindstone01. You definitely want all the tires on the rear axle to be as alike as possible, so move a front Michelin 235/80 to the rear and put the Toyo 245 on the front. No worries there. If you are a purest, either get a second Toyo or a second Michelin for the front, but there is no technical reason to do that.
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Old 11-19-2019, 11:37 AM   #13
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Agree with grindstone01. You definitely want all the tires on the rear axle to be as alike as possible, so move a front Michelin 235/80 to the rear and put the Toyo 245 on the front. No worries there. If you are a purest, either get a second Toyo or a second Michelin for the front, but there is no technical reason to do that.
Having done this very same thing numerous times over the years on Semi tractors loaded heavily it wouldn't be an issue on the front since they are similar in design and tread depth
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Old 11-19-2019, 12:51 PM   #14
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OP kinda sketchy on the details. How did the new M tire go flat? If tire was defective M company should cover it and give you a new tire. If OP error, improper inflation or overload then your sol. The odd tire should be on the front for obvious reasons stated by others, most important reason would be increased friction and uneven ware with unmatched axle and more importantly a dual.


Also what did the roadside tire service advise you. He probably advised you that his tire should only be considered a short term temporary fix to get you straight to a shop for a matching replacement? Otherwise he and his company would be responsible for any subsequent problems by not having the correct tire for you.


BOTTOM LINE in dual applications:
If you do not match the tires the larger tire will be forced to carry an increased load and in extreme cases can result in failure.
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