Hey guys,

I have a 2011 jk sport. I bought the jeep with a 2.5 in lift and 33's (295/70R17), but it still has the stock spare tire. I don't plan on buying a matching spare wheel, since the stock rim is a 16 inch, would there be any issues with running a 285/75R16? I'm just going to run a cover over the tire anyhow. I have open diffs, and this would only be for a spare situation, to get me off the trail, or back into town. I don't do anything intense, just would like a better matching spare than the stock one. Only thing I could think is the back spacing of the stock rim ( could only run spare on back axle) or if it would mess with the BLD?




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Bad plan. Your ESP will have issues with it (speed sensors at every wheel). It will put a ton of stress on your traction control, potentially damaging it - not to mention that it seems unsafe. I also believe it has the potential to overheat and damage the spider gears.

Besides all that, it looks stupid to not have a matching spare. Why not at least get the same size tire if you are already getting one? If it is a rim size issue, sell your spare and buy a used stock wheel and get the right tire.

 

We are talking half an inch, assuming the tire size from different manufacturers measure to what they calculate. So you are basically saying if you don't run the same manufacturers for all 5 tires you run the risk of messing everything up? I promise you that you can find a 1/2 difference from tire wear, tire pressure, a number of issues. Obviously I would want the tires to be very close,
Would measure before purchase. Just my thoughts.


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If you are talking about a trail or emergency spare then I see no issues...I would typically run the odd tire size on the front.

If you are talking about a spare to swap into your rotation sequence...I would suggest finding the same size to run.

 

Get the right size tire and wheel. You have to consider the offset of the stock jk wheels vs aftermarket. You risk more expensive parts running like that. My brother did a similar thing with his chevy hd and had to replace the front gears afterwards.

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This is what I'm talking about. Emergency only. I would drive less than 50 miles on it until I could get it fixed. For limping out of the woods.



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Ok, so what do you do when you take a road trip and you blow a tire. It's a Sunday and your options are limited. It's a total pain in the a##. Sure, you can find a tire shop and they'll like not be giving a great price. Plus, I don't know about you, but I place a value on my time. Screwing around for hours dealing with a blown tire is a pain.

A proper sized spare is just plain common sense. Especially for a Jeep, since a trail blowout could mean a totaled tire. Then you have to search for a good priced replacement and possibly wait and have the Jeep off the road.

 

I have been stuck without a spare on a trailer before so I understand what you're saying. Just searching to see if it was a possibility. Looking back I would have made them throw in a matching spare on the deal.


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I say it's fine. If you really wanna worry about an 1/2 inch just inflate that on more and deflate till others match mounted height lol

 

I wonder what the tolerances are on tire molds? I come from plastic injections molding and can tell you that a rubber like material is different to predict the exact shrinkage on. Many things affect it, weather, shot speed, etc. what if the tires were made on different days? I'm just saying a 1/2 on a tire wouldn't be a huge deal.


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