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Old 02-25-2012, 10:51 PM   #1
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Spare tire size

Right now I am running 30x9.5s on all corners and the spare is still the original 28 incher (225x75R15)

I would imagine that if I got a flat I could currently use the spare to get to the nearest Pep Boys (I get free flat fixes there)

However, this summer I am planning to upgrade to 32x11.5s. I can't imagine that the 28s will still suffice as a spare.

At what size difference is the spare rendered useless?

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Old 02-26-2012, 02:18 PM   #2
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Yes you can use a smaller tire as a spare and drive on it if necessary. Just don't use 4x4.

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Old 02-26-2012, 02:26 PM   #3
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A lot of Jeep clubs or off road parks require you to have a spare the same size to run with them. I strongly recommend a full size spare as I notice when a tire is only 5psi low. What you have now may suffice but budget for a 5th when you get bigger tires.
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Old 02-26-2012, 03:35 PM   #4
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Do you have limited slip in the rear diff?
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Old 02-26-2012, 04:29 PM   #5
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Originally Posted by freeskier View Post
Do you have limited slip in the rear diff?
I just have the factory diff (05 Wrangler X)
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Old 02-26-2012, 04:39 PM   #6
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I am planning to get a full size spare...but i'm thinking bout mounting it on top on a safari type rack/cage. Really like the way they look and capable of hauling tools, coolers,cans, on top. But i have drove home with 38s on 3 corners and a 31 on one side. Effective but hillarious to watch.
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Old 02-26-2012, 07:18 PM   #7
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I just have the factory diff (05 Wrangler X)
Yeah, and the factory diff is either open or has the factory limited slip. Find out what you have. If you do have limited slip don't put the spare tire on the rear axle, you'll burn up the clutch pack. Only put the smaller spare tire on an open diff.
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Old 02-26-2012, 07:48 PM   #8
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Having a different size tire on one side is not going to harm a limited slip axle. Many of models come with donut spares that are not the same diameter as the stock tires. My Mustang (89) spare with a limited slip is not the same size as the stock tire and I have used it several times in 23 years.
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Old 02-26-2012, 07:50 PM   #9
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If you must, only put the smaller spare on the front axle. And only if it is open.
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Old 02-26-2012, 08:28 PM   #10
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According to my build sheet I have the dana 30 front axle but all it says about the rear is 175MM with the 3.07 gearing
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Old 02-26-2012, 08:53 PM   #11
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I am running 31 x10.5 and my spare is the same size. It just fits the rear stock spare carrier on my '98 TJ
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Old 02-27-2012, 09:54 AM   #12
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Get the 5th tire and rotate all. The extra mileage from a full set will offset the cost easily and you will not have to worry about the wrong size ever. Some places give a discount on all five (for example ordering from Discount Tire here on the board or asking at a local to match the offer). Plus a full size matching spare looks good.

Replace the stubbers on the back with hockey pucks trimmed to fit. Will cut the distance out in about half (giving more threads to put lugs on) while still maintaining vibration control. Ordered my pucks online from Sports Authority. Cheapest place I could find in stock.
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Old 03-01-2012, 09:08 PM   #13
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Get the 5th tire and rotate all. The extra mileage from a full set will offset the cost easily and you will not have to worry about the wrong size ever. Some places give a discount on all five (for example ordering from Discount Tire here on the board or asking at a local to match the offer). Plus a full size matching spare looks good.

Replace the stubbers on the back with hockey pucks trimmed to fit. Will cut the distance out in about half (giving more threads to put lugs on) while still maintaining vibration control. Ordered my pucks online from Sports Authority. Cheapest place I could find in stock.
so the hockey pucks are required to fit a 31x10.5x15 spare in the stock carrier? I would like to get a matching spare, as mine is a 30x9.5x15 compared to 31x10.5x15 at all 4 corners. also, will i need to remove/modify the stock 3rd brake light?

Thanks!
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Old 03-02-2012, 07:18 AM   #14
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Will my tailgate be able to support a 32 inch tire?
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Old 03-02-2012, 07:50 AM   #15
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so the hockey pucks are required to fit a 31x10.5x15 spare in the stock carrier? !
It depends on the back spacing of the rims. The spare must stay tight against the rubber snubbers on the tailgate and tub. Most aftermarket rims have less backspacing therefore are further out.



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Will my tailgate be able to support a 32 inch tire?
Yes. I've had a 33x12.5 on for over 4 years.
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Old 03-02-2012, 08:07 AM   #16
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Quote:
Originally Posted by ski0rb0ard
Will my tailgate be able to support a 32 inch tire?
I had a 32x11.5 bfg a/t on for a month on cragar soft 8s and it started creaking so I took it off until I can either get puck spacers or a whole tire carrier. Just make sure you put spacers on
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Old 03-02-2012, 08:27 AM   #17
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Originally Posted by crocker_dave View Post
so the hockey pucks are required to fit a 31x10.5x15 spare in the stock carrier? I would like to get a matching spare, as mine is a 30x9.5x15 compared to 31x10.5x15 at all 4 corners. also, will i need to remove/modify the stock 3rd brake light?

Thanks!
To clarify; I have stock wheels w/ 31x10.5x15
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Old 03-02-2012, 11:08 AM   #18
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Quote:
Originally Posted by Neil F. View Post
Having a different size tire on one side is not going to harm a limited slip axle. Many of models come with donut spares that are not the same diameter as the stock tires. My Mustang (89) spare with a limited slip is not the same size as the stock tire and I have used it several times in 23 years.
yes, and you are supposed to put the donut spare on a non drive wheel. like if you mustang got a flat back tire, the spare tire goes up front, and your good front tire goes on the back
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Old 03-02-2012, 11:45 AM   #19
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Real quick can someone tell what the hockey puck trick is?
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Old 03-02-2012, 11:57 AM   #20
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Quote:
Originally Posted by TJspeed View Post
Real quick can someone tell what the hockey puck trick is?
it is to space out the little tire bumpers on your tail gate so the are snug up against your spare tire, keeping it from moving around.
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Old 03-02-2012, 12:30 PM   #21
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yes, and you are supposed to put the donut spare on a non drive wheel. like if you mustang got a flat back tire, the spare tire goes up front, and your good front tire goes on the back
Owner manual says nothing of the sort. Had the car since new. In 23 years I have used the spare srveral times.
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Old 03-02-2012, 12:53 PM   #22
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Quote:
Originally Posted by Neil F. View Post
Owner manual says nothing of the sort. Had the car since new. In 23 years I have used the spare srveral times.
last car i had with a donut spare said to do just that in the owners manual(a 93 pontiac). ive noticed it to be a common thing, especially in newer cars(you know those calls in the middle of the night from friends cause they have a flat tire and dont know how to change that. yup, i get those a lot). with older cars it may not be much of an issue. but with newer ones, apperently it is.
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Old 03-02-2012, 03:34 PM   #23
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yes, and you are supposed to put the donut spare on a non drive wheel. like if you mustang got a flat back tire, the spare tire goes up front, and your good front tire goes on the back
Don't from a 96 Mustang owner's manual. It has a limited slip and nothing about put on front:

When you drive with the temporary spare tire,

DO NOT:

exceed 50 mph (80 km/h) under any
circumstances.

load your vehicle so that it is heavier than
the maximum vehicle load rating listed on
the tire decal.

tow a trailer.

use tire chains on this tire.

try to repair the temporary spare tire or
remove it from its wheel.

use the wheel for any other type of vehicle.

drive through an automatic car wash with
this tire. Because the temporary spare tire is
smaller than a conventional tire, it reduces
the ground clearance. Your vehicle may get
caught in the rails and it could be damaged.
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Old 03-02-2012, 04:56 PM   #24
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interesting, thats the first one i can recall seeing that doesnt tell ya to do that.
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Old 03-02-2012, 08:57 PM   #25
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it is to space out the little tire bumpers on your tail gate so the are snug up against your spare tire, keeping it from moving around.
Or in my case, I swapped the snubbers with the pucks and it let the rim sit a bit closer so I could get more threads on for the lug nuts.
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Old 03-02-2012, 09:04 PM   #26
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so the hockey pucks are required to fit a 31x10.5x15 spare in the stock carrier? I would like to get a matching spare, as mine is a 30x9.5x15 compared to 31x10.5x15 at all 4 corners. also, will i need to remove/modify the stock 3rd brake light?

Thanks!
Not required, but for my Duratracs I felt it fit too tight. I replaced the snubs with pucks and sawzall to fit. My brake light fits fine, but you just want to watch how tight you put your spare's lug nuts on if you have the hardtop w/wiper (it edged mine back a bit where the wiper would rub on the light). With your soft top you should be good to go.

Mine is on the Canyon rims like yours too.

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