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Unread 05-23-2010, 05:01 AM   #1
06choppertj
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Spare Tire Size; Axle Damage If Unequeal ?

Is it rumor or fact ? On a jeep, if you put a spare on that is smaller, bigger, than the other 3 tires, will you damage the diff. ? For example, the doughnut spares that are on all newer vehicles are the norm. They seem to function well with no adverse affects. What say `Ye ?

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Unread 05-23-2010, 05:06 AM   #2
JeepRocks86
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do you have a locker?

I've run a smaller spare before and didn't have a problem.

Also, I've heard problems of off sized tires causing problems. One story was that the R&P kept having troubles because of the front 2 tires being 1/2" difference in size.
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Unread 05-23-2010, 05:34 AM   #3
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As long as you don't have a locker or a limited slip it shouldn't be a problem. If you do have a locker or LSD then the tires must be the same size.
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Unread 05-23-2010, 08:47 AM   #4
djt283
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As long as your axles are stock and no limited slip in the rear, you'll be fine. Proof of that is new jeep models with solid rear axles come with undersized spare tires on the low-end models.
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Unread 05-23-2010, 08:52 AM   #5
xjfever
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That is only on all wheel drive jeeps, or like stated above those with lockers. If you run it in 4wd with a smaller spare it can cause problems, but in 2wd on open diff's the odd sized tire will do no harm.
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Unread 05-23-2010, 12:15 PM   #6
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If you have a LSD, you are not going to distroy it. A LSD is slipping all the time in normal conditions (cars with donuts have LSDs also) A smaller spare will cause constant slip but it's not going to make it expload or wear it out quickly.
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Unread 05-23-2010, 12:47 PM   #7
van1
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Using a smaller spare...

W/locking diff. Dont do it unless it is your last resort...as it would be hard on the components and driving as it would act like you were constantly turning, drive slow...

W/LSD Don't do it unless it is almost your last resort(I wouldnt do it) unless it was the last resort. On a LSD with clutches it would cause wear and is hard on it...still drive slow but would be easier than a locked diff

W/open I would do it, but don't do it for long periods as it makes the diff work harder and causes wear as it would be constantly working the spider gears.

I might end up running a smaller spare, but I wouldnt run it long. Just for me to get somewhere to get the org. tire fixed. This is much better than no spare....
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Unread 05-23-2010, 05:52 PM   #8
06choppertj
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Thanks everyone for your responses. I appreciate it. You have helped me make a good decision on tire set ups.
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Unread 05-23-2010, 09:05 PM   #9
djt283
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Quote:
Originally Posted by van1 View Post
Using a smaller spare...

W/open I would do it, but don't do it for long periods as it makes the diff work harder and causes wear as it would be constantly working the spider gears.
What happens then when my open diff goes around turns? If I make a bunch of rights in a row will my gears shatter?
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Unread 05-23-2010, 09:18 PM   #10
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Quote:
Originally Posted by RogueSpear2023 View Post
As long as you don't have a locker
With a selectable locker unlocked, no problem...
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Unread 05-23-2010, 10:26 PM   #11
J03_TJ
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I know I wouldn't do it with my rear Truetrac and front Aussie. I know the front would handle it for a while as long as not in 4x4, but the rear would also get a workout I would think.
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Unread 05-23-2010, 11:52 PM   #12
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Quote:
Originally Posted by van1 View Post
Just for me to get somewhere to get the org. tire fixed. This is much better than no spare....
Having tires of drastically different sizes on an open differential only cause uneven tire wear on the other tire and maybe a little pull from the weight being off balanced from the lean. As others said the LSD/lockers won't like it either.

Short term don't worry about it, long term....... there shouldn't be a long term.
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Unread 05-24-2010, 08:30 AM   #13
chadsmeltzer
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Quote:
Originally Posted by djt283 View Post
What happens then when my open diff goes around turns? If I make a bunch of rights in a row will my gears shatter?
Do you drive in circles for 100+ miles? It won't be a problem with different sized tires for short distances, but don't just leave it for weeks/months.
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Unread 05-24-2010, 09:37 AM   #14
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great question! Thanks
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Unread 05-24-2010, 09:48 AM   #15
wlmonk
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My two cents: If you are putting a spare on a LSD, the spare doesn't need to be the same SIZE as the other three tires, but it should be the same DIAMETER.

Just wanted to clear that little matter up.
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