WHT_JKUR

I recently added an addition Jeep to the family (bought my daughter a stock 08 JK). The previous owner had put on 285s. Noticed the rub at full turn, so I decided to Installed washers. Fixed problem, with Minimal overall impact to turning radius. Here is a link. A very quick fix. I spent about $2 at Home Depot (grade 8 washers)

https://wayalife.com/showthread.php/...top-Adjustment

Do have concerns about rubbing when off road , but at this point her Jeep is an on road vehicle. I am sure we will try it out off road at some point and, if it is an issue, I can figure out a much more costly solution . Lol

Mr.T

Yep, keep an eye on it -- but it will probably be fine. Mine has the light OME springs so the bump stops get some use when disconnected.

Mlupacchino

How much of a difference in gas mileage and power do you notice with the 285s?

Mr.T

255-75/17 are 32.2" and 285-70/17 are 32.8" which equates to 1.8% less torque -- Not noticeable. Since the diameters are so close, MPG is more a matter of the particular tires rolling resistance. The GY Adventures on mine had no measurable affect on MPG compared with the BFG KM's.

WHT_JKUR

Jeep had 285s when I bought it for my daughter, so I don't have comparison. Frankly I was concerned about buying the 3.8. (Our other Jeep has the 3.6). The 3.8 actually seems to still have enough giddy-up (Note it is a 2dr).

Mileage around town is about 17. ... I have driven Jeeps for almost 25 years, and I have resolved myself that I am okay with the mileage trade off. .

Mlupacchino

It's not the height difference that is the problem with the gas mileage but the width and weight difference. The more road contact, which there is over an inch in width difference, the more friction and energy it takes to rotate the tire. Also, the more weight on the tire (285/70/17's are about 10 lbs heavier each over stock 255/75/17) the more power it takes to move them. Someone once that that tire weight is equal to 2x weight elsewhere on the vehicle.


Pics of jeep with the tires? What type of tire? How is turning radius? Thanks!

WHT_JKUR

Will try to get pics/tire info tonight when I get home. As far as turning radius, frankly I did not notice much of a difference after installing washers on steering stops... used 2 washers per side. The 2 doors turn on a dime.

WHT_JKUR

Tires are Yokohama Geolander AT/S. Probably not something I would buy, but they were almost new when I bought the Jeep. Ride is pretty good and My daughter loves the Jeep, so they work for now. For some reason, the app is not letting me upload a picture. Will see if I can get one uploaded

zstairlessone

Just something I learned the hard way, use stainless steel washers to adjust the stops.

Mlupacchino

Any luck?