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Old 05-26-2009, 03:43 PM   #1
jwm1986's Avatar
Join Date: Dec 2008
Location: Evansville, IN
Posts: 1,024
Different tire sizes?

Will a one inch difference hurt anything? The people who had my Jeep before me got the same size spare and all but never used it. Now most of my tires are about gone with one in particular that's really bad. I wanted to replace that bad tire with the spare (new rubber) but there is about a one inch difference in total height.

This gonna be ok or should I just not use it... I remember seeing dif sizes were bad but couldn't find anything saying why or to what extent you can go before damaging anything.

2000 Jeep Wrangler Sport
4.0L / 5spd
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Old 05-26-2009, 04:09 PM   #2
KBR97's Avatar
Join Date: May 2008
Posts: 5,136
You could put it on till you buy new tires wich hopefully wont be to long. I wouldnt drive around any longer than needed.
Put the smaller one in the back and DO NOT put your jeep in 4wheel drive.

The different size tires, when in 4x4, will work against each other and may cause damage to the differentials. Kinda the same idea as why the front and rear gear ratios need to match.

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Old 05-26-2009, 04:10 PM   #3
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Posts: 2,775
One inch wouldn't really hurt anything when it's just getting you to the tire store.

I would not recommend "daily" use of a mismatched spare. Reasons are:

1. If you have a locker on that axle, using the tire will destroy the locker.
2. If you have a limited slip on that axle, you will probably destroy it (or at least wear it out much faster).
3. If you have it up front, your alignment will be gone and your tires will wear much faster and the vehicle won't want to track nearly as well.
4. If you hang it in the rear, the handling of the vehicle (especially in hard/emergency braking situations) won't be great either.

Or, the short version is: Buy a new tire to replace the bad one now and get a same size spare when you can. Some places may trade your "good" spare for a not quite so good tire for cheap/free or search crapslist/ebuy.
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Old 05-26-2009, 04:29 PM   #4
jwm1986's Avatar
Join Date: Dec 2008
Location: Evansville, IN
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Ok. Just sucks that it was never rotated in. Now I have a basically useless tire. I'm going with something else next time so yeah. Maybe someone will buy it still. 32" goodyear wrangler mt/r (New, but mounted)
2000 Jeep Wrangler Sport
4.0L / 5spd
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Old 05-26-2009, 04:35 PM   #5
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It's not exactly "useless". It will get you off the trail or side of the road and down to the tire shop.

No 4x4 when it's on there (especially if you lock up) but it'll get you home.

Do some shopping/trading. You might be surprised to find out what some 32" MT/R guy would pay for a legacy MT/R.
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