The SKINNY on skinny tires

No spacers, I’m planning on getting a swing out for the rear, so I did not have the spare put underneath. I have read that you can get it to fit. You can search for it and a few comments about it comes up.

 

Yea, the OEM on mine are great road tires but my first impression in a couple inches of snow is not very promising.

 

Do any or all of these sizes fit on stock suspension without rubbing issues?
I have a 2019 Off Road DCLB. I’d like to put them on a set up SCS f5 wheels. I’m open to 16” or 17”.
255/85/16
255/75/17
255/80/17

 

I don't know if the geometry and fitment are different on the third gens, but I have the OME 2.5" lift and 255/80/17s on my 2011. It also has an ARB bumper and winch. They rub a little on the corner of the fender flare and inner fender on the outside part of the rear portion of the front wheel wells.

 

Ive read in this thread that 255/85r16 or 255/80r17 will rub a bit on the fender liner.

For those of you running this tire size, can the rubbing be resolved with a heat gun?

Also, how’s the rubbing off road?

Much appreciated

 

I’m looking for a used or spare Cooper tire STT pro discover LT235/85R16 and thought this thread might be a useful resource. I got a great deal on them and they helped get me introduced to 4wheeling.

well a couple weekends ago I got a small gash in one tire and, though it holds air, it makes a bubble when driving at highway speeds. So it’s off the truck and I’m on my original wrangler as a spare.

I know it’s a long shot, just looking to see if anyone has a used or spare tire they don’t need and want to sell.

I’m located in north Orange County.

[edit - also something I’ve learned and others should note is that using a tire size smaller than what the truck recommends voids the warranty on these tires. Tires sizes equal to or larger do have warranty.]

 

Welcome to the forum!

Make sure you check the B/S/T section and local threads for OC areas. Craigslist is also a good resource, as well as Facebook Marketplace.

 

Just got my Maxxis 255/85/16s put on my 2020 OR tonight. Walmart took almost 4 hours to mount them and broke two of my TPMS sensors....

 

Are they replacing the sensors?

 

Yea they will. They got some generic valve stems from oreillys for now and will be ordering two replacement TPMS.
Typically i would go to discount tire but the tires from walmart were cheap and the $25 hazard warranty/lifetime balancing is too good to pass up

 

Also what PSI do you guys typically keep your 255/85/16s at? These are 8 ply, load range D and Walmart filled them to 65 psi which is the max tire PSI.

Im use to having 35" KM2 and KM3s which i ran at 28psi on my Jeep so im not sure if its normal to run such a has PSI on these truck tires

 

It's not. That pressure is way too high unless you're carry a massive load. Most run something between 28psi and 35psi depending on their weight.

 

35 would be a good place to start.

 

That blows. Any resolution?

 

Yes, it does. I am keeping an eye on exhaust heat...its a little close to the pipe.

 

Use simple math to determine the correct PSI.

Follow this example replacing the numbers here with those from your truck and tires. A long time ago, a member on here used the same method and it was spot on. I looked for it but found this instead. Same principle

Calculate Tire Pressure

After talking to a few guys about tire pressure, I was worried. Everyone seems to have a different opinion on tire pressures when converting from a p-metric tire to an LT tire. Many say you are fine to go by what is written on the door, which is not always correct.

Here is how I personally calculate tire pressure. You need to get the specs from YOUR tire on the sidewall.

The XXXXX has a curb weight of 5,690lbs. We need to add some weight because we have 1-2 people, bumper(s), winch, sliders, heavier tires, wheels, skid plates, lights, roof rack, etc.

I don't want to have to calculate all of that, so lets just round up to 6,000 lbs.

6000/4 = 1500 lbs per tire.

The XXXXX TIRES in XXX/XXRXX are rated at 3,640 lbs @ XX psi. EACH.

If you take 1500/3640 = .412

That means that I am loading up 42% of what the tire can handle (these are load range E tires -- some of you only have D tires).

Now, if you take 42% of 80 PSI you get 33.6.

That means that I should be running NO LESS than ~34 PSI in each tire.

To play it safe, I will run 35PSI and give me some leeway

 

Unfortunately it's not that simple.

Really what you need to is figure out what the load rating for your stock tires is, and look up the load table for the tire you want to put on. That will tell you the psi needed to maintain the carrying capacity of the OEM.
Using your method yields a pressure of 37-38psi, which according to this would be inadequate.
Link for the entire PDF here
https://www.google.com/url?sa=t&sou...FjASegQIBxAF&usg=AOvVaw0zaHumL9xB01d0CRYFLPCS

 

Shouldnt the chalk line test tell you if theyre properly inflated?

 

30 will have better grip, less power to the ground and a softer ride. 40 will have better gas mileage and lower turning effort at the expense of bumpy hard ride.

35 is just right

 

Update:
My Maxxis bighorn do rub a bit in the front at full flex