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Old 03-19-2016, 07:47 AM   #1
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Not sure if this is the correct place this post but here goes:
I have a class A motorhome with 5-Goodyear G670 RV 275/70R22.5 While doing a inspection of tires I discovered that the drivers rear inside dual tire is not a Goodyear.
I understand that having matched tires mounted can wear out both tires on the dual wheels. The single tire that does not match in manufacture is a Michelin 275/70R22.5 (Same Size as Goodyears) The tread design is very close in design. Can I put the Michelin on the front axle and move the Goodyear. In my opinion, having matched tires on the rear dullies and having the Goodyear and a Michelin of the same size on front axle shouldn't cause any problems. Is my thinking correct?

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Old 03-19-2016, 08:16 AM   #2
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I see an awful lot of trucks with two different tires on the duals. As long as they are the same size and load rating, and are wearing normally, I would leave them there until one or both need to be replaced. Having two different tires on the front is a different story. I would want them to match to ensure predictable steering and braking performance.

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Old 03-19-2016, 08:26 AM   #3
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You do not have an issue.
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Old 03-19-2016, 08:37 AM   #4
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I think the dates are more important,just got back from having new tires put on due to dates.
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Old 03-19-2016, 08:46 AM   #5
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Leave it where it is. It's hurting nothing and more important for steer axle tires to match. Answer based on 42 years OTR on all types of trucks.
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Old 03-19-2016, 08:59 AM   #6
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The problem really is you have no idea how long this tire mismatch has been on your new to you coach,

As stated above, you will see a lot of commercial trucks on the road with mismatch brands on the duels. This does not mean it's ok because their could be a slight difference in tire height, that's a bad thing. Tire tread design will yield different friction characteristics.

This is not an immediate danger but you will need to watch closely for rubber dusting, and that's a sign you need replace the mismatched tire.

Never mismatch your tires on the front axle, the same aforementioned characteristic differences will in most cases cause a pull to one side and bad handling.

Bottom line, wait and see with the match up on the back, it's much safer. Be sure to keep the air pressure matched.

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Old 03-19-2016, 09:28 AM   #7
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If I'm not mistaken, the Michelin does not have the same loaded radius as the Goodyear, which would shift more weight (and wear) to the larger loaded radius tire. Personally, I would arther have matched pair on each dually.

Go to each manuf website, and look up the specs. I'd also want know what the tire pressire inflation tables say. One brand tire may require different TP than the other, for a given axle weight.

You could call each manuf, and ask them if it's acceptable.
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Old 03-19-2016, 11:45 AM   #8
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As mentioned, you do not know the history of this tire... And also, what may have happened to it's mate that matches the rest.

Just last week, I watched a gent pull in off of the highway into a fuel station. Flasher's on as he came on in. He had an inner blowout. I asked how long had he driven to get off the freeway, and he said about 24 miles at 20-25 miles an hour. So the outside tire, carried the full load for that distance.

Without knowing the history, you could be driving on a tire that had been structurally stressed due to how it was used. You can't see this. And even removal and full inspection from the inside, may not show a problem. But if abused, you could have a damaged cord, broken band, etc.

The cost of ties are high, the damage caused by a blowout can be higher. And, losing control and having an accident trumps all other considerations. Hurt yourselves, or others, or both.

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