spare tire size difference - JeepForum.com

 
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post #1 of 12 Old 05-12-2014, 07:24 AM Thread Starter
Hendrix9
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spare tire size difference

Hey guys, quick question for you. How picky is quadradrive 2 about small tire size differences between the other 3?

My spare tire is practically new and the rest are almost at end of life. (stock forteras) One has started to get a slow leak(and I can't seem to figure out from where) so I was thinking about just throwing the spare on until I get new tires in a couple weeks. Would that create any issues?

Thanks.


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post #2 of 12 Old 05-12-2014, 07:40 AM
caulk04
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I've been seeing 1/4" and even 1/8" difference mentioned here by reasonable good sources.

I'd recommend getting 5 new tires and keeping the spare rotated in so they always have the same tread life. This holds especially true for me since I went up to 255/60-18...

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post #3 of 12 Old 05-12-2014, 09:03 AM
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^^^ While I'm not disputing what you've mentioned regarding slight differences causing issues, I have a hard time believing that mismatched tread depth on Forteras is gonna jack the system up.

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post #4 of 12 Old 05-12-2014, 11:28 AM Thread Starter
Hendrix9
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I've procrastinated getting a lift, and i have 4 265/75/17s sitting here(lightly used and i need another used for a spare), so i'm really just trying to get by until i can fit the 265/75s. I guess i'll try it and hope for the best, or leave a small compressor full in the back just in case... Lol

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post #5 of 12 Old 05-13-2014, 02:03 PM
10Xk
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Subaru states that if you need to replace one tire that all 4 must be replaced due to the AWD system. Just something to think about.
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post #6 of 12 Old 05-14-2014, 07:30 AM
koj
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I run 265/70x17 and have kept my OEM spare. When using the spare I simply disconnect 1 ABS sensor which disables all differential lock up, ABS system. I then avoid low. Seems to work fine so far.

WH 2010 CRD. Bilstein shocks, Rustys 2" BB front, OME HD springs rear. 265/70x17
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post #7 of 12 Old 05-14-2014, 08:43 AM Thread Starter
Hendrix9
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Quote:
Originally Posted by koj View Post
I run 265/70x17 and have kept my OEM spare. When using the spare I simply disconnect 1 ABS sensor which disables all differential lock up, ABS system. I then avoid low. Seems to work fine so far.
I was wondering if there was a way to disable that. I'll remember that. I'm going to keep limping my slow leak tire around. My spare tire's valvestem was broken but I got that fixed this morning, so at least I even have a spare now... That woulda really pissed me off on the side of the road.

I figure if worst case I'll run the new-ish spare tire at a lower tire pressure to try to get it closer to the diameter of the others. That and maybe disconnect an ABS sensor like you suggested.

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post #8 of 12 Old 07-10-2014, 12:56 PM
jeepinmoe
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Quote:
Originally Posted by koj View Post
I run 265/70x17 and have kept my OEM spare. When using the spare I simply disconnect 1 ABS sensor which disables all differential lock up, ABS system. I then avoid low. Seems to work fine so far.
Where do I disconnect that? Thanks for any info.
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post #9 of 12 Old 07-10-2014, 01:44 PM
japeart
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You should just be able to hit the ESP button and turn it off. That's i've done in the past.

Put a hole in the side wall of a bfg all terrian. stock size, about 3 months old with around 10000 km on it. when i put the stock spare forterra on, the size difference cause the ESP to go nuts and turn itself off. so i just turned it off whenever i drove the jeep til new tires came in.

since my tires were pretty new i just replaced the two rears and used the 5th tire for my new spare. the esp didnt have any issue with front and rear slightly different size.

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post #10 of 12 Old 07-11-2014, 01:57 AM
koj
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The sensors are located at each wheel and have a connector in the wheelwells. The easiest to get at is in the left fron wheelwell. Just turn the front wheels fully and disconnect the ca le

WH 2010 CRD. Bilstein shocks, Rustys 2" BB front, OME HD springs rear. 265/70x17
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post #11 of 12 Old 07-11-2014, 04:38 PM
danb303
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I've wondered the same. I bought a set of used rubicon pull offs that have different tread depths. 2 are 40% and 2 are 60% and the spare is still new. I have an OME ordered and if the rest of it ever comes in I plan on running the 2 60% tires I'm the back.

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post #12 of 12 Old 07-12-2014, 12:27 AM
modernblueWK
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If you have QD2 then you have mechanicsl limited slip in the diffs. Odd tire size may be an issue for the diff.

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