Spare Tire Size; Axle Damage If Unequeal ? - Page 2 - JeepForum.com
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post #16 of 19 Old 05-24-2010, 09:02 AM
Neil F.
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It does not have to be the same diameter. Look, countless vehicles with limited slips are equiped with doughnut spares that are not the same diameter as the stock tires. It will cause some amount of wear BUT it is not going to be a problem.

Doughnut spares are not new. My 89 Mustang (body style and spare configuration originated in 79), factory LSD came with a donut which I have used severals times in the 260k mi I have driven the vehicle.


Last edited by Neil F.; 05-25-2010 at 04:58 AM.
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post #17 of 19 Old 05-24-2010, 10:08 PM
J03_TJ
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Originally Posted by Neil F. View Post
It does not have to be the same diameter. Look, countless vehicles with limited slips are equiped with donut spares that are not the same diameter as the stock tires. It will cause some amount of wear BUT it is not going to be a problem.

Donut spares are not new. My 89 Mustang (body style and spare configuration originated in 79), factory LSD came with a donut which I have used severals times in the 260k mi I have driven the vehicle.
I thought about this, and once I figured it all out went with this. So you get into needing to bolt on your smaller diameter spare onto a LSD. Just being into a Jeep and all, most people on here would agree, undo wear and tear is only good while you are having fun, not driving home one a smaller spare wondering why you chose that path.
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post #18 of 19 Old 05-26-2010, 05:06 AM
wlmonk
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Well, it looks like all the votes are in on this subject and I'm not really sure who won but....and I don't really wish to be argumentative here....when I installed larger tires on my '03, I researched the crap out of this subject because I wasn't sure whether to buy four new tires or five new tires.

Yeah, there were opinions going all over the place but, at least when I researched it, the general consensus seemed to be this: on any Jeep Wrangler having an axle with a limited-slip differential, both the driver's side tire and the passenger's side tire should be the SAME diameter.

Am I absolutely certain that information is 100% correct? No. But, in my mind, when I really think about it, it makes sense to ME for MY Jeep. And I guess that's what really matters to me. I'd rather err on the side of caution in this case. Just taking care of ordinary little repairs on my Jeep keeps me busy. I really don't have the time (or money) to get into major repairs.

Thanks for letting me state my opinion. Does anyone out there have experience in this area?
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post #19 of 19 Old 05-26-2010, 05:27 AM
JeepingNet
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Originally Posted by wlmonk View Post
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.
That is a very good point I used to run a narrow spare on my old Jeep but it had the same diameter. Much less weight to carry around but get solution when you get a flat.

I think picking a spare depends on how remote or long trips you take.. If you are never going to have a long drive after getting off the trail then it doesn't matter you can always limp home or to the shop. If you need to perhaps drive 4 hours on your spare then you need a good spare.

Colin Jennings
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