35" vs 37" Tires (and lift) on a JLRU for Daily Driver at 70-90 mph

  1. HealthRebel

    HealthRebel Well-Known Member

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    I wanted to pose this question about 35" tires vs 37" tires on a JLRU for a daily driver. In the Dallas/Ft. Worth area, unless you are driving 70-90 mph on the freeways, you WILL get run over. I prefer the looks and clearance advantages of 37" tires over the 35" tires, but was curious about how secure the ride is when traveling 70-90 mph? I commute about 30 miles a day. My understanding is that 35" tires on the Rubicon will work fine on the factory wheels/rims and that, for the most part, a lift is not needed. For the 37" tires, wider wheels/rims are recommended and a minimal 2" lift is needed, although most of you have probably gone with a 2.5" - 3.5" lift. So I guess the question has to include a lift with the 37" tires.

    Answers here would really be important for those of you who have had both 35" tires and 37" tires/with a lift setups. As always, thank you for your responses
     
  2. JROOO

    JROOO Well-Known Member

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    Where I live I rarely hit the freeway but when I do, I put my sailing hat on. Yarrrrr....
     
  3. xtopherm

    xtopherm Well-Known Member

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    I think you can swing 37s on 2 inches of lift with the right wheels. But keep in mind that you are opening a signifcant can of worms. A stock suspension on 35s will ride and handle pretty nicely for your highway commute and will have pretty good ground clearance on the weekends. Nice looking stance too. A lifted jeep with 37 inch tires is going to be a LOT less fun on the highway, for one additional inch of clearance at the pumpkins (though break-over, approach and departure angles will be better). 37s put a lot more strain on the axles, brakes and other drivetrain components. And that is in addition to the big price you pay on handling, gas milage hit, gearing/acceleration, road noise, cost etc.,

    In other words, 35s on a stock Rubicon suspension represent a good chunk of the value for a tiny fraction of the cost and aggravation. No doubt 37s have some real advantages (and millions of fans), but they take you down a significant wormhole of "I had to upgrade this because I upgraded that." If your Jeep will spend every single weekend on the trails and you don't mind the tradeoffs during the week, it's certainly worth it. But if it is primarily a highway vehicle, used for very occasional trail-running, you might want to just spend a little bit of the money 37s will end up costing you on a winch and tow strap and don't worry about needing to pull cable or take a bypass once every couple years. A Rubicon on 35s is an extremely capable vehicle - probably more capable than most drivers are skilled?
     
  4. Rogues Gambit

    Rogues Gambit Well-Known Member

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    Watching, I'm curious as well, especially as NO ONE drives under 75 unless they're old enough to be the grandparents I don't have, or embrace their stereotypes
     
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  5. OP
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    HealthRebel

    HealthRebel Well-Known Member

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    Thank you. Your response was VERY valuable. If I went with 35" X 12.5" X 17" tires on stock Rubicon wheels/rims, would I need to consider wheel spacers to clear the fender wells with lock to lock steering? Also, I love the looks when the tires stick out a couple inches past the outer edge of the stock fenders. Would the fact that the tires are 12.5" in width achieve this look or would wheel spacers behind the factory Rubi wheels be necessary?
     
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  6. Sean K.

    Sean K. Well-Known Member

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    Depends on your set up. If your tires balance nicely (our's don't...they're 37" beadlocks)...then up to about 75 is fine...after that is a lot of vibration. And we arent' running a lift.
     
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  7. Sean K.

    Sean K. Well-Known Member

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    Stick out has little to do with tire/rim width and everything to do with backspacing (or "offset"). Yes, spacers will put them out more.....but may create a whole new problem of clearing things like the Rubi rock rails or front bumper depending on your lift or willingness to cut things off.
     
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  8. Gallagher

    Gallagher Active Member

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    I have a '19 JLUR with a 2" BDS lift and 35-12.5-17 BFG KO2's on stock Rubicon wheels. I would say that the ride is basically indistinguishable from stock. With the stock rims and 35's I have not even come close to having tire contact with any part of the vehicle and I do not have spacers. No hint of additional wander or wobble ever. Admittedly, I am not a serious off road guy, but the jeep has seen moderate trail use with times where 4 Lo, F&R lockers and swaybar disconnect were in use.

    As far as the tire poke goes the outer shoulder of the tread is barely covered by the stock flares, and the widest part of the sidewall is about an inch outside of the flares. I also like the look of the tires sticking out a couple of inches from the flares, and I bought 2" spidertrax spacers when I bought my lift and tires. Unfortunately, I bought JK spacers not realizing the difference in the lug sizes between the JK and JL, so returned them and have not yet purchased the spacers for the JL....not sure that I will at this point as I really like the look.

    All in all, I am VERY happy with the package, ride and handling is basically as it was stock, and I also tow a boat with it which is why I finally decided on 35's instead of 37's (boat and trailer package is just under the 3500lb tow limit). If my Jeep was stolen tomorrow I would put a replacement together exactly the same way as my current ride.

    Jeff
     
  9. Roky

    Roky Well-Known Member

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    I’m on dirty life bead locks, 37/12.50/ 17s. -12 offset, 4.5” backspace. Travel sometimes an hour or two on freeway to get to wheeling destinations. At 75-80 mph, like being in a car. I can’t pinpoint why it drives so good, could be the tire/rim combo, or my Frankenstein lift I honestly don’t know. Here’s how much they stick out. I realize not everyone has the same taste in rims but I’m really impressed by these bead locks, they balanced out with not much weight. They’re a little heavier than most rims, maybe that has something to do with it, it’s above my pay grade.....:)

    84307A8E-CF58-4B49-BC0D-0C8269767AEC.jpeg93E1A38B-4E70-4EE2-877E-EDDDA95B2714.jpeg
     
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  10. OP
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    HealthRebel

    HealthRebel Well-Known Member

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    Very nice!!!!
     
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  11. Roky

    Roky Well-Known Member

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    Thanks!
     
  12. RELBUS

    RELBUS Well-Known Member

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    I am on the mopar 2" lift and 37" STT pro's and run 75-80mph on my 30 mile commute...all of which the first mile and last mile are highway. The JL is not my daily, I end up driving my Ram on days it rains and in the winter months...but in the summer and when its nice the JL is a pleasure to drive, and I drive it as much as I can.

    I am blown away at how nice it drives.
     
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  13. Sean K.

    Sean K. Well-Known Member

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    Did you actually have them balanced? I haven't tried it....just assumed the tire shops would tell me no.
     
  14. Roky

    Roky Well-Known Member

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    Yes, my 4x4 shop has a 17,000 dollar road force balance machine, latest and greatest I guess. About all they do there is big tires and a lot of bead locks.
     
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  15. Sean K.

    Sean K. Well-Known Member

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    Yeah, it's a Hunter GSP 9700 (or newer model number) for the Road Force Balancer.

    Thanks for the tip....I'll have to check into it.
     
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