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Old 12-01-2014, 09:38 PM
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Trick question for you Jeep experts ???

I have a 2015 JK. I cant afford 5 tires so I purchased 4 32inch tires and 17 inch wheels. Which means I have stock (sport tinny ) spare. If I ever got a flat and had to run the small spare, wouldnt the traction control think one tire was going faster then the other and then apply the brakes ??

can it be done - running with a small spare

Ps Scott

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Old 12-01-2014, 09:40 PM   #2
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good question, but I really doubt it is enough of a diameter difference to cause issues. not really a definitive answer but it will get you to a tire shop.

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Old 12-01-2014, 09:43 PM   #3
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Did you have the 29 inch factory tires? Otherwise the stock tires are 32 inches? And arent stock wheels 17 (18 on Sahara)?

That is a pretty big difference if you had 29 inch - I would hunt Craigslist or local 4 wheel shops for a takeoff to match the other 4 or at least something the same size.

I choked last week buying 5 tires (37s) but I knew I needed a spare so had to suck it up.
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Old 12-01-2014, 11:25 PM   #4
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I haven't had a spare for over a year and a half...haven't needed one. Now, it is better to be lucky, than good...so if you feel you need one, buy the correct size, and get it into the rotation while you're at it
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Old 12-02-2014, 12:12 PM   #5
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Mismatched tires or using improper inflation pressures for all-wheel drive and four-wheel drive vehicles can also result in immediate drivability problems. Some Control Trac equipped vehicles in 4Auto mode may exhibit a shutter on acceleration and/or a noise from the front driveline and transfer case while driving. Some all-wheel drive and four-wheel drive vehicles may exhibit axle windup or binding while driving. Some four-wheel drive vehicles (manual or electronic shift) with a two-wheel drive mode may refuse to shift "on the fly" into 4x4 Auto or 4x4 High at highway speeds.

Tire Rack.....
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Old 12-02-2014, 12:27 PM   #6
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I agree with Jeepersteve, I would not run a different size tire on any all wheel or 4 wheel drive ever.
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Old 12-02-2014, 01:24 PM   #7
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Quote:
Originally Posted by Jeepersteve View Post
Mismatched tires or using improper inflation pressures for all-wheel drive and four-wheel drive vehicles can also result in immediate drivability problems. Some Control Trac equipped vehicles in 4Auto mode may exhibit a shutter on acceleration and/or a noise from the front driveline and transfer case while driving. Some all-wheel drive and four-wheel drive vehicles may exhibit axle windup or binding while driving. Some four-wheel drive vehicles (manual or electronic shift) with a two-wheel drive mode may refuse to shift "on the fly" into 4x4 Auto or 4x4 High at highway speeds.

Tire Rack.....
This actually got me a free spare, when my 37's were at 60% I had a rod go through the lugs (still good), tire shop wanted to warranty it and replace the tire. managed to convince him that I couldn't drive with the size difference and they let me keep the new one.
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Old 12-03-2014, 11:38 PM   #8
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If you are concerned about traction control, turn it off
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Old 12-04-2014, 12:04 AM   #9
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If the difference in diameter is not much less than 1" I would not worry it will be like you are running tyres for 50k km and then you need to put the brand new spare to replace the damage one it will be a difference from new to used
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Old 12-04-2014, 12:14 AM   #10
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If you have to run the spare. Don't put it in 4wd. That's basically spinning your tires then popping into 4wd. It's not good and will cause damage.
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Old 12-06-2014, 10:53 AM   #11
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By a tire plug kit and a cheap portable compressor. My 110 in the jeep runs my compressor great. The odds of you getting a flat you can't repair are incredibly slim. Thats why you see so many people running no spare at all.
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Old 12-06-2014, 07:54 PM   #12
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I keep plugs and a compressor. It is a lot easier to plug and air up than change tires anyway. But it is not an option all the time. In fact my last 2 flats resulted in a gash in the tires that could not be repaired. Had to mount the spare and buy a new tire. Once I was 20 miles from pavement so having a good spare is a good idea. At least I was close to needing new tires each time anyway and just bought a whole set both times.

I'd spring for the 5th tire and wheel ASAP. Certainly before your 1st rotation then just throw it into the rotation.

In the mean time invest in plugs and a compressor, it may be all you need. If you have to run the small spare turn off traction control and do not use 4X4.
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Old 12-06-2014, 09:58 PM   #13
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I see lots of cars running those little donut spares lol. I think as long as you have an open differential you will be fine. So if you have LSD then maybe put the spare on the front. Like was said just to get you to a tire shop etc. I would not drive 75mph but I would not worry about going slow tho.
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Old 12-07-2014, 12:26 AM   #14
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I see lots of cars running those little donut spares lol. I think as long as you have an open differential you will be fine. So if you have LSD then maybe put the spare on the front. Like was said just to get you to a tire shop etc. I would not drive 75mph but I would not worry about going slow tho.
That will work assuming he doesn't pop it into 4wd. Key thing to remember.

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