Tire size and spare tire - JeepForum.com
 
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post #1 of 5 Old 10-22-2004, 03:35 PM Thread Starter
canuckJGC
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Join Date: Oct 2004
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Tire size and spare tire

I looked at a bunch of threads but I haven't seen this come up. My '98 JGC Laredo came stock with 225/75/15. I want to replace the tires with Michelin LTX A/T but they only come in 235/75/15. The tire diameter is within 3 % so should be ok (can anyone confirm?) but I'm not really interested in replacing the pristine spare tire as well which is 225. If I had to use the spare 225 with 3 other 235's, would this be a major issue for the Jeep? It's not that big a difference, but I don't want to cause any damage either..

Thanks!

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post #2 of 5 Old 10-22-2004, 04:29 PM
Meerkat
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Location: Belle, WV
Posts: 4,930
Here is what the recall states:
Recall - Spare Tire

No. 757

January, 1998

To: All Jeep(R) Dealers

Subject:
Safety Recall # 757 -- Spare Tire

Models:
1996 Model Year Jeep Grand Cherokee (ZJ) Vehicles Equipped With a Quadra-Trac 4WD Transfer Case (Sales Code - DHR) and a Compact Spare Tire

Installing the compact spare tire in either a front or rear position on about 65,000 of the above listed vehicles, may cause front axle damage and/or a vehicle fire. To correct this condition, the compact spare tire must be replaced with a full size (conventional) spare tire and wheel assembly. The new spare tire and wheel assembly will NOT match the other tires and wheels on the vehicle and is still intended for use only as a spare tire.

What my Jeep got outfitted with as a full size spare under this recall is a 245/70R15. What came with as factory issue is the 225/70R16.
Comparing the tires, I find that there is 0.36% difference in the tire diameter between the two.

When I compare your 225/75R15 to the 235/75R15 I see that the 235 is 2.05% larger in diameter (28.28 inches vs. 28.87 inches) or about 1/4 inch in radius.

If I were in your place, I wouldn't worry too much about it, but by the same token, if I had to use the spare, I would endeavour to get it repaired ASAP.

HTH

Warren
Black 1996 5.2L ZJ Limited
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post #3 of 5 Old 10-22-2004, 04:53 PM Thread Starter
canuckJGC
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Thanks so much. I'm thinking of taking out the spare altogether and just relying on an 'Airman' or other inflation/repair kits while on the road (put the spare back in for offroad). Here's a review if anyone is interested:

http://www.canadiandriver.com/articles/pw/airman.htm

Curious if anyone has considered going this route....
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post #4 of 5 Old 10-22-2004, 05:02 PM
Meerkat
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1996 ZJ 
 
Join Date: Apr 2003
Location: Belle, WV
Posts: 4,930
I have not personally considered it, but thought I would mention that over the years, every single flat I have had out on the highway (long trips vs. about town), involved damage to the sidewall, or full tread seperation from the carcass.
Around town, I have had flats caused by nails and screws that were easily plugged, but out away from home it seems everything is bigger and sharper.

HTH

Warren
Black 1996 5.2L ZJ Limited
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post #5 of 5 Old 10-22-2004, 05:06 PM Thread Starter
canuckJGC
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Very good point...maybe I'll stick with both systems, at least the inflator deal looks easier for my wife when she's alone, rather than jacking up the beast.
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