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Old 06-23-2019, 12:36 AM #1
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running different size tires across from each other

so in the old days, your weren't supposed to run different size tires on either side of the axle cause the "spider" gear would spin too fast.

i am running 285/70 coopers on my rig but my spare is still the old original tire size 265/70



does anyone know if i put it on the front or rear in the event of a flat, will it cause any real damage, i do have the trail edition so it has a locker rear end, not sure if that makes any difference.

thanks for any good info.
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Old 06-23-2019, 12:58 AM #2
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if you're only in 2wd you can drive with the spare on the front wheel no problem.

on connected axles (i.e. rear axle) you need to run same size tires. 4wd also shouldn't be used with the spare of a different size on
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Old 06-23-2019, 01:42 AM #3
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Quote:
Originally Posted by llDemonll View Post
if you're only in 2wd you can drive with the spare on the front wheel no problem.

on connected axles (i.e. rear axle) you need to run same size tires. 4wd also shouldn't be used with the spare of a different size on
I would agree with this
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Old 06-23-2019, 08:59 AM #4
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It's no different than running one of those dumb "space saver" donut spares. Just keep the speed down and get it fixed as soon as possible. And yes, don't use 4wd.
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Old 06-23-2019, 02:05 PM #5
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Keep it under 50 and get it fixed ASAP and it is no more harmful than driving a twisty road.....the bigger the discrepancy in size the harder it is on the spiders too.
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Old 06-23-2019, 06:45 PM #6
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Quote:
Originally Posted by 83Mule View Post
Keep it under 50 and get it fixed ASAP and it is no more harmful than driving a twisty road.....the bigger the discrepancy in size the harder it is on the spiders too.

on either front or rear? or only front in 2wd?
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Old 06-24-2019, 10:40 AM #7
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on either front or rear? or only front in 2wd?
only front and only in 2wd.
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Old 06-24-2019, 10:53 AM #8
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Quote:
Originally Posted by llDemonll View Post
if you're only in 2wd you can drive with the spare on the front wheel no problem.



on connected axles (i.e. rear axle) you need to run same size tires. 4wd also shouldn't be used with the spare of a different size on
Jeep sold vehicles with donut spares and solid axles for years.

The point is that it gets you to a repair facility, not that it gets you across the country. I don't see an issue using it on the rear just to get you to a shop.

Now if you have a spool in the rear, that's a different issue and not going to work.
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Old 06-24-2019, 11:13 AM #9
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I got a flat a couple of weekends ago up in the mountains, had to put my stock spare on while running 275s. Got me home just fine.
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Old 06-24-2019, 03:01 PM #10
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As others have said. It would be a pain but put the spare in the front, even if you have to swap out the front to the back and don't put it in 4wd. I just bought a used KO2 on offer up for like $20 and once my current set wears out ill just have the tire shop put the best 285 on the spare and chuck the used KO2. Spare tire is supposed to get you home / shop. Should't use it beyond that.
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Old 06-24-2019, 06:52 PM #11
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running different size tires across from each other

Quote:
Originally Posted by llDemonll View Post
only front and only in 2wd.


Enlighten me on why not on the rear of a 4wd??? Assuming you are not using 4wd.


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Old 06-24-2019, 09:02 PM #12
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No issues on the front in 2 wheel at all..........and the bigger the variance the quicker you need to fix it and the slower you need to drive until doing so on the rear. I would drive it home or to the Tire shop within 20 miles, no sweat. If you need to do 100 miles home on the Freeway, put it on the front.
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Old 06-25-2019, 11:14 AM #13
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Quote:
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Enlighten me on why not on the rear of a 4wd??? Assuming you are not using 4wd.


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technically it's likely not going to hurt anything as that's what a differential is for, but it's easier to tell someone "run tires the same size on the same axle" than it is to add a bunch of caveats to the mix. personally if the situation allows i'd always put the spare on the front
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