Concerns going to 285/70R17s

[Deano]

1st post- 4th Jeep. I would like to hear input from those who have 3.6 engine, auto & 373 gears- that have installed 285/70R17 tires on their rig. I am concerned about loss of power, shift points being affected badly, drastic MPG loss, and any other issues caused by 285 tires. Do you really need to recalibrate tire size/ speedo? I am changing wheels- so rubbing issues are eliminated. Also, I am trying to find the lightest 285/70R17s that I like. Daily driver, some light off road wheeling, 20 mile interstate drive to work, and use Jeep for vacation trips and so on. 2015 JKU Sport, 3.6, Automatic, 373 gears, both tops (only 1 on at a time:yup. I have looked thru out the forum, but would like to hear directly from folks who have actually experienced this setup/ scenario- Thanks in advance.

 

[RockyJk]

I've been running that set up for the past year. I didn't notice much of an mpg drop, I didn't recalibrate the speedo till just recently and didn't have any issues without recalibrating

 

[Clark Griswold]

It is manageable, I ran it for over a year but decided to recalibrate with a flashqal as I started doing a lot of highway driving, any slight incline and it shifts down to forth and sometimes 3rd. Drive it for awhile and see what you think but I am much happier with it recalibrated.

 

[2nd.gunman]

I'm running the same except for 4.10 gears and if anything I think it settled it down a little. It used to shift funny at times with the stock tires but hasn't since the change. I haven't noticed any real difference in mpg but I do probably 60% on road mainly in traffic and 40% off road. I running stock wheels and haven't had any issues with rubbing even when fully flexed out. I am running a 1 3/4 BB but still have stock bump stops and in Australia all JKUs get the sport suspension. Here's a couple photos showing the flex

 

[GraniteCrystal]

I had that for a day but was having rubbing issues on stock Rubi wheels so I changed them out. Sounds like you took care of that though.

 

[cramey74]

I'm running 285/75-17 Nitto Tera Grapplers on stock rubi wheels with 1.5 Spidertrax spacers. The 75 series is a full inch taller than the 70. I have no issues with the gearing. It acts fine on the highway and I have only noticed a combined 1 mpg loss in fuel mileage.

 

[TLC Offroad]

I have been looking at putting 285/70R17, Toyo Open Country R/T on My Rubi, I have the EVO Level Lift on mine with Stock Rubi Rims will I have to add spacers? to keep them from rubbing?

 

[RockyJk]

I have been looking at putting 285/70R17, Toyo Open Country R/T on My Rubi, I have the EVO Level Lift on mine with Stock Rubi Rims will I have to add spacers? to keep them from rubbing?

You don't have to but they will rub a little at full turn

 

[TLC Offroad]

You don't have to but they will rub a little at full turn

Thanks for the INFO :thumb: I just wanted to make sure before putting new tires on it. I'm going to stay with stock rims for now but I may change My mind if I find something I like.

 

[Dopey84]

I'm running 285/65/18's on mine with the Evo leveling kit and use spidertrax 1.5 wheel spacers... Worth the investment if your not upgrading your wheels plus it gives a better stance . Otherwise get the annoying rub at full turn..

 

[2nd.gunman]

I'm running 285/70/17 on stock rims no spacer and only get slight rub on the sway bar when aired down. I wasn't even aware of it till I saw the wear marks on the sway bar it's so light

 

[Kalums]

I'm running the 285/70/17 duratracs on stock moab rims, little rubbing with no spacers, I did recalibrate for the size using the flashpaq. Still getting 16 mpg while doing 75 on a 30 mile each way to and from work. They look good with the leveling kit.

 

[AllAmericanInfidel]

I ran 285/70R17 BFGs on my rig initially with 3.73s. I used the AEV ProCal to correct for tire size. I can honestly say I saw no difference from stock.

Here is my rig with the 285s with no lift...


And with a JKS JSPEC 2.0 lift, which netted me exactly 3" of actual lift..

 

[Labricon]

285/7017 GY DURATRACs on 2015 Rubicon with 3.73 gears

AEV 2" lift, AEV Pintler wheels and Procal used to recalibrate for tire size....city and highway driving with virtually no change from stock performance. The tires have performed well on pavement, sand, gravel, mud, snow and ice but have not been on rocks yet.