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Old 04-07-2011, 08:40 PM   #1
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Two different tire sizes on my jeep.

3 of my tires are 235 and the spare that i have been using as the 4th tire is a 225. Can i continue to do this or should i have all 4 the same exact size?

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Old 04-07-2011, 08:50 PM   #2
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Do you have open diffs?

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Old 04-07-2011, 09:03 PM   #3
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yes open dif
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Old 04-08-2011, 07:35 AM   #4
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Is the height the same? That's more important than the width....
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Old 04-08-2011, 09:16 AM   #5
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Is the height the same? That's more important than the width....
Isn't the 225 or 235 the height of the tire???? I thought the second number with the width ratio?

Here is all that I know on this subject. My parents have a jeep grand Cherokee. A few years back they had a flat tire and put the spare on. My dad had the flat fixed and stuck it underneath the jeep as the spare. A few months later the rear end went out of the jeep. He was told by the dealership that it was due to him driving on the spare. Even thought it was a full size spare there was a slight height difference since the original tires had worn and the spare was new so it was a little taller. They said that it was a slight difference but had things in a bind for months. Not sure if this is true or not but his is what the dealership said was the cause. It was under warranty so they fixed it, and I don't know why else they would come up with this story since it was on them to fix it.
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Old 04-08-2011, 09:34 AM   #6
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225 is the width. 225mm wide. the second number is the height, represented as a percentage of the width. so the height of a 225/70 tire is 70% of 225mm.
before you say it, you're right, it is stupid.
height is much more important than width. different height tires affects handling and greatly increases wheel bearing wear.
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Old 04-08-2011, 11:09 AM   #7
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If the circumference of the tires is the same, then you are o.k.. The odd sized tire should go on the front until you can get it replaced. I can tell you that 100 miles with a 33" on one side and a 30" on the other, you will be purchasing new spider gears for your axle. It won't be nearly as bad with the difference you have, but it will still heat up and wear your spider gears with excessive driving.
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Old 04-08-2011, 12:36 PM   #8
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OP, we need the full size, not just the section width. We need the aspect ratio and wheel diameter to determine the total diameter of the tire.

In 2WD and open diffs you can run 4 different tire sizes, won't matter. If you have an auto locker you MUST run the same size tires on that axle. If you have a selectable locker you can again run 4 mismatched tires *AS LONG AS YOU DON'T TURN THE LOCKER ON*.

In 4wd one smaller/larger tire will work, as long as they are on open diffs.

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