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Old 09-08-2012, 07:36 AM   #1
jmarmor's Avatar
Join Date: Sep 2012
Posts: 80
Mixing tires

I had a blow out on one of my rear dual axle Goodyear G670 tires. They were 8 years old. Minimal tread wear,just old. I had a new one replaced on the shoulder of a major highway. The tire cost me $750 as I expected. Now I wish to use Michelin XZA2 energy tires to replace the remaining three tires on this axle. Can I mix in the one new Goodyear in with the Michelin of the same size? I'd hate to discard the new tire I just put on. My front tires were replaced two years ago so no need to put it upfront. Thanks

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Old 09-08-2012, 07:50 AM   #2
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Yes you can mix those since they are the same size and it is the drive axle. I would check the date code(s) on the Goodyear and then the Michelins. If they were not within 6-8 months of each other I would hesitate to combine them. It is NOT advised to mix steer tires. Another option would be to use the GY as a spare and just keep it in the basement. Also, have you compared the weight rating at a given PSI? If they are not identical you would need to run different pressures. For me at least the spare tire idea is looking better.

2007 Allegro Bus 42 QRP, 400 ISL now 2017 LTV Serenity on a 2016 Sprinter chassis
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Old 09-08-2012, 08:28 AM   #3
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I would not mix the two brands unless and until I was positive that the rolling diameter and revs/mile were identical or very, very close. Two tires of the same size are not necessarily identical in all respects.

If I were in your shoes, I would buy another G670 to pair with the existing one. Maybe put them on the front if you want 4 Michelins for the rear. At worst, put the two G670 on one end and the two Michelins on the other.
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Home is in the Ocala Nat'l Forest near Ocala, FL
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Old 09-08-2012, 08:53 AM   #4
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Spartan Chassis
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there is another factor to consider and that is tire slip angle. That is how much deflection a tire will make in situations like during a turn.

Definition of tyre Slip Angle

Tires of the same size but different models of manufacturers will have different slip characteristics so I would be especially careful on mixing dual tires in any manner. Even mixing different tires front and back could have some handling quirks if the front tires slip significantly different than the rear.

Anecdotally, when I bought my RV it came with the standard Michelin tires on the rear that where 7 years old and a 2 year old set of Goodyear G series on the front that were also a "match" but not exact. I knew I would replace all tires when I bought it. Before I did that the steering seemed a bit wonky, especially in turns. After the replacement I was MUCH happier with the handling. Certainly new tires generally help but I think getting all tires matched up played a part.
Don, Sandee & GSD Zeus. Guardian GSDs Gunny (7/11/15) & Thor (5/5/15)
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Old 09-08-2012, 10:22 AM   #5
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I have successfully mixed tire brands on the drives, but rapid uneven wear can be a result in some cases.

The trick I used to overcome uneven wear is to use a piece of white chalk and make a straight line across the tires and then take a few mile run down the road. When you stop, look at the chalk lines, if the chalk lines are not the same on inner, and outer tires, an adjustment in in order.

If the chalk is gone in only the middle of the tire, it is inflated over the ideal pressure. If the chalk is gone from the edges only, this indicated under inflation. If the chalk is ALL gone, the tire is running flat against the road and all is fine.

How this works with mixed is if the lines are not the same on both inner and outer tire, at the same pressure, an adjustment is necessary so they DO come out the same.

Personally, I run my tires a little overinflated, so my chalk lines will be visible on the outside edges if the test was in a straight line.

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