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Tire recommendation for JLU Sport S with stock wheels

Optvader

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Looking for some recommendations on tire sizes for a JLU Sport S with a 2.5 inch MOPAR lift kit. I currently have 275/70/R18 KO2’s installed with the factory wheels but now that I have the lift installed I’m kinda thinking a need a little bigger tire. I am a new Jeep owner and have looked all through the forums but I thought I would just post and see what people’s thoughts are.
Jeep Wrangler JL Tire recommendation for JLU Sport S with stock wheels 7D27504B-5A2F-4186-A2B6-228D941D4BD4
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dajaga

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I got Falken at3w 275\70r18 with the 2.5 RC spacer lift, I love the look with a little more gap. Think it looks great
 

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Black rhino Barstow 17x9.5 -18 offset. Toyo open country AT2 35x12.5. I have the rough country 2.5” spacer lift.

D317B94E-4107-4761-8594-10D795E54EC1.jpeg
 

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Another vote for keeping the 275/70's. It's easy to buy tires on how they look or how they make us feel, but the truth is there is a safety consideration to be made when you add larger tires. Unsprung rotational mass is a big deal and affects stopping distance and brake life.

I recently found a cool java script calculator that takes tire dimensions and weight, calculates rotational inertia, and converts it to an equivalent mass. Since I am considering a tire purchase myself, here are two examples I found rather enlightening:

BFG AT KO2 in 265/70 C load rating: 44 lb, but equivalent mass of 82 lbs.

BFG AT KO2 in 285/70 E load rating: 61 lb, but equivalent mass of 114 lbs.
 

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Stuckinthesand

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Another vote for keeping the 275/70's. It's easy to buy tires on how they look or how they make us feel, but the truth is there is a safety consideration to be made when you add larger tires. Unsprung rotational mass is a big deal and affects stopping distance and brake life.

I recently found a cool java script calculator that takes tire dimensions and weight, calculates rotational inertia, and converts it to an equivalent mass. Since I am considering a tire purchase myself, here are two examples I found rather enlightening:

BFG AT KO2 in 265/70 C load rating: 44 lb, but equivalent mass of 82 lbs.

BFG AT KO2 in 285/70 E load rating: 61 lb, but equivalent mass of 114 lbs.
Yes you are correct in that it affects stopping distance. I do give myself a little more time to stop but that is normal for me. I don’t see it being a big deal as most jeeps go to 35’s from the stock tires if they do any kind of sustained off-roading. Also if the brakes weren’t able to handle 35’s I don’t think FCA would be advertising that they could handle 35’s with no modifications on the rubicon at least.
 

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Yes you are correct in that it affects stopping distance. I do give myself a little more time to stop but that is normal for me. I don’t see it being a big deal as most jeeps go to 35’s from the stock tires if they do any kind of sustained off-roading. Also if the brakes weren’t able to handle 35’s I don’t think FCA would be advertising that they could handle 35’s with no modifications on the rubicon at least.
It can handle it. but it isnt a smart thing to do unless you will really use/need the bigger tires. I wouldnt run 35s on a sport without also upgrading my brakes. 33s is plenty big for most folks. The Wrangler is a very light truck.
 

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^^^ This. I think 99.99% stop their tire purchase analysis at "will it fit?" There's so much more to it.
 

Stuckinthesand

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It can handle it. but it isnt a smart thing to do unless you will really use/need the bigger tires. I wouldnt run 35s on a sport without also upgrading my brakes. 33s is plenty big for most folks. The Wrangler is a very light truck.
I’ve been fine on my original brakes. I’m at 18k miles on my 19 sport s. I do wheel mine regularly though. If it was just a daily driver only I’d tend to agree with 33’s being plenty.
 

entropy

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I’ve been fine on my original brakes. I’m at 18k miles on my 19 sport s. I do wheel mine regularly though. If it was just a daily driver only I’d tend to agree with 33’s being plenty.
Peeps have been wheeling with 32s and 33s for a very long time. Of course 35s will simplify things off roading and if you use them quite a bit thats great. I know the brakes would still work, but you reduce a lot of stopping power. I was just saying, if I was ever going to go 35s, I would personally upgrade to the rubi brakes.

Hows the spacer lift working out for you?
 

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Stuckinthesand

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Peeps have been wheeling with 32s and 33s for a very long time. Of course 35s will simplify things off roading and if you use them quite a bit thats great. I know the brakes would still work, but you reduce a lot of stopping power. I was just saying, if I was ever going to go 35s, I would personally upgrade to the rubi brakes.
No worries man. Just a good conversation. I like seeing everyone’s point of view. Helps people make informed decisions. That’s what this forum is all about. Stay safe out there.
 

Stuckinthesand

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Peeps have been wheeling with 32s and 33s for a very long time. Of course 35s will simplify things off roading and if you use them quite a bit thats great. I know the brakes would still work, but you reduce a lot of stopping power. I was just saying, if I was ever going to go 35s, I would personally upgrade to the rubi brakes.

Hows the spacer lift working out for you?
Sorry missed the spacer lift question. I haven’t had any issues yet. I also still manually disconnect. I don’t do anything above a mild blue trail. It is still my daily as well so I don’t need to break it. Lol.
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