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post #1 of 5 Old 11-21-2016, 10:44 AM Thread Starter
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JK Safety Question

Just got a 2014 Sport and put on 285-70-17s ... they look awesome and I did not have to raise the Jeep. I am planning on giving the jeep to my daughter shortly and my question is whether going to these larger tires/rims has made the jeep inherently more or less safe? Will the larger tires affect the way the anti-roll or stability features work? Is it an more or less inclined tip/roll or do these tires not make any difference. Thanks in advance.
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post #2 of 5 Old 11-21-2016, 11:23 AM
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The electronic stability features will still work.

Is it less inherently safe than with the old tires? Probably. It will sit a bit higher, larger tires are more work for the brakes, etc. Depending on what model tires you came from and what you now have it may be better or worse in the rain and snow.

However, the difference is likely very small. The difference in inherent safety between your old and new tires is likely much smaller than the difference between the Jeep and say, a Honda Civic. In other words, if you trust your daughter in your Wrangler, I wouldn't worry too much about the small difference in those tires (unless they are just terrible road tires or something). If she's a careful, attentive, defensive driver, she'll probably be fine either way. On the other hand, if she's as likely to park the Jeep in a ditch as she is in the driveway, the tires probably won't help/hurt much.

Edit: Just my humble opinion.

Last edited by BigTB; 11-21-2016 at 11:32 AM.
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post #3 of 5 Old 11-21-2016, 11:43 AM
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Given the dimensions of the stock 255/75 vs the 285/70, I'd say it's nearly a wash...the difference in diameter is about the same as a new tire vs a tire that needs replacing. The Jeep's programmers have to have taken that into account when setting operational parameters for the stability systems, ABS and TC.
- Diameter is the factor being addressed when people make corrections to the Jeep's programming through devices such as a ProCal.
- Lift kits will make much more of a difference in stability and there's no available programming corrections to alter gravity.

The 285 lifts the Jeep only about 1/3" and the track, assuming you're using the OEM wheels, is still the same...but the footprint is over an inch wider side to side. I think the wider print will be felt in the seat of the pants and, regardless whether the nanny systems are there, a wider stance is almost certainly better.

Of course, there is the tire bias to consider. Is it a street tire, a mud tire or a compromise? Each will have their own characteristic handling qualities that may not translate well in an environment other than for what the tire was designed.

So, stock wheels and, out of curiosity, what tires?
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post #4 of 5 Old 11-21-2016, 11:58 AM Thread Starter
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Actually I bought new rims ... KMC XD122 black. 17"x9". Tires are Duelers. Someone here gave me great advice on these being about as big as you could go without lifting. They look great and don't rub. Appreciate the comments guys.
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post #5 of 5 Old 11-21-2016, 12:08 PM
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Quote:
Originally Posted by funfred View Post
Given the dimensions of the stock 255/75 vs the 285/70, I'd say it's nearly a wash...the difference in diameter is about the same as a new tire vs a tire that needs replacing.
Only thing I'll add is that some of the sports have much smaller tires (225-75R16). So it may be a larger difference than that. However, it is true that the size he installed isn't much larger than the largest stock option.

Edit: And those rims probably end up in a wider track, so the tip-over risk may not have increased.

Last edited by BigTB; 11-21-2016 at 12:11 PM.
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