35" tire + stock spare? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 10 Old 11-16-2010, 07:28 AM Thread Starter
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35" tire + stock spare?

Why cant you use a smaller spare in the rear? Wouldnt the differential account for the difference in rotational speed? (assuming you are not locked)

Sorry for my lack of mechanical knowledge on this. I just dont have a tire carrier yet so I have my stock spare on the tailgate and have been wondering if I can even use it.

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post #2 of 10 Old 11-16-2010, 07:31 AM
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I'd say you can use the stock space, but not for very long in any situation. I 've still got the stocker for my spare and thank God I haven't used it yet.

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post #3 of 10 Old 11-16-2010, 07:36 AM
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Too much difference in size between stock and 35 to be safe. You may get away with a short run up a city street, but def not on the hwy, and not on the front at all.. Not worth even chancing it IMHO. You may get away with this on a little car with a spacesaver, but not on a straight axle vehicle especially with an LSD.

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post #4 of 10 Old 11-16-2010, 07:38 AM Thread Starter
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Quote:
Originally Posted by jtphoto JK View Post
Too much difference in size between stock and 35 to be safe. You may get away with a short run up a city street, but def not on the hwy, and not on the front at all.. Not worth even chancing it IMHO. You may get away with this on a little car with a spacesaver, but not on a straight axle vehicle especially with an LSD.
Yeah this is pretty much what I have heard -- but why is this the case? What happens when there is such a discrepency in tire size? Do the gears bind or something? Or do they wear unevenly?

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post #5 of 10 Old 11-16-2010, 07:38 AM
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If you have two open axles, don't use 4x4 and fully disable the ESP you "can" use the smaller tire

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post #6 of 10 Old 11-16-2010, 07:48 AM Thread Starter
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Originally Posted by Goodysgotacuda View Post
If you have two open axles, don't use 4x4 and fully disable the ESP you "can" use the smaller tire
Yeah thats what I was thinking. It would literally only be to get me to somewhere where I can get a tire fixed and also only until I can save enough for a tire carrier (im thinking OR Fab....).

Trust me.... if I can help it I wont do it. I just dont want to risk damaging the tailgate with my 35" spare in the meantime as I am not nor do I know any welders to re-do the spot welds on the tailgate.

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post #7 of 10 Old 11-16-2010, 08:12 AM
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Yep, that the only way to do it without damaging anything. I ran my 35 on the gate for over a year and have no side effects from it on my gate. I used a 1.5" wheel spacer, daystar bumps,and let the plastic bumper take some of the wiggle out of the tire. The aftermarket "spacers" put the tire higher, and too far out. The wiggle of that tire will kill the spot welds, made mine hardly move and see no reason why I couldn't continue doing so for about 20,000miles, lots of hard trails (including whups/small jumps) and a 35" km2

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post #8 of 10 Old 11-16-2010, 01:21 PM
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Stock Rubi wheel w/ 35" KM2 and no spacer. The tire is held tight to the bumper. No movement and no noise. Done this with 2 diff JKs with no issues.
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post #9 of 10 Old 11-16-2010, 03:22 PM
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I have my 35 on the stock mount as well and like the other guys said the bumper supports part of the weight. With two different size tires on the axle the spider gears will be in constant motion and create a lot more heat and your abs won't like it either.

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post #10 of 10 Old 11-16-2010, 04:22 PM
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Quote:
Originally Posted by KMCobra64 View Post
Yeah thats what I was thinking. It would literally only be to get me to somewhere where I can get a tire fixed and also only until I can save enough for a tire carrier (im thinking OR Fab....).

Trust me.... if I can help it I wont do it. I just dont want to risk damaging the tailgate with my 35" spare in the meantime as I am not nor do I know any welders to re-do the spot welds on the tailgate.
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