i have same vehicle and run 235 85 16 for years hauling dbl axle trailer weighted down and never had any trouble. i recently got a set of cooper wild country xts for 850 out the door. the width is there but the tread is narrower.

 

Dont go larger than 235. My dually came with 265-75's, looks killer, but has spacers and the tire is to wide for the stock rim so the centers wear quicker than the outsides. I cant do a 6 tire rotation because of the alum. outer/steel inner wheels on rear. I am going to go with a narrower tire but keep the height next time. I have been told you cannot run alum. on both rear wheels?? Is that true??

 

The only reason you would not be able to run aluminum wheels on both inside and outside is because of the length of the wheel studs.

 

Length of wheel stud is the only reason?? GVW is not the reason??

 

Hmm 235/85 I wonder if I can go that large? Mine is 2WD so I worry also about the front wondering if they will rub anything? Also, on the rear if they are too close together I wonder if I will have problems with chains? I do like the look ofthe larger tire though. Maybe 235/75 would be better?

Mike

 

The first number is width. So 235 is wider than 215. The second number is height so 85 is taller than 75. Michelins run fairly thin. You probably know this I just thought I would mention it. Different manufacturers of tires even though the same size can vary quite a bit. I'll have to check with an acquaintance of mine with a rig similar to yours. He was having tire woes with a wider tire on his dually. I'll post up when I get the info. Are those rims of yours stockers or aftermarket?

 

Ya Pete after I posted about the 235/75 it dawned on me that is actually a smaller tire, doh. Ya the 4 outside rims are stock Ford (Made by Alcoa but have a Ford PN on them) the inside rear is steel. No rotating of tires due to this. All I could do is swap front then swap the rear (L to R).

Mike

 

Well it turns out he is running a 255 size tire with spacers between the rear rims. I don't think you would have an issue with a 235. But do consider Costco wont mount any tire other than the stock size.

 

No GVW isn't the reason, cost of two additional aluminum wheels is the reason only the outside wheels are aluminum from the factory... The aluminum wheels have the rated weight stamped on them.

 

Weither or not a 235 will fir dual depends on the wheels.
Stock wheels, they should barely fit without rubbing.

After market, depends on the width and backset.

Wider that 235, spacers will be needed.

My comment about 6 spacers above, he was running something like 325/70 mud tires, and I forget what wheels.

No spacer on the front and the turn radius was terrible with the inside of the tires rubbing the springs.

Rear spacers to get the inside tire off the springs there as well.

As I remember he also had to trim on the fender opening and bumper ends for clearance.

 

Thats about right! I know that as I have been pricing tires, I am looking at a size bigger then what mine originally came with, and going as large as possible without havig rubbing issues, especailly under load. I decided on a 225/85R16, AT too.

 

I was running 235/85/16's until the 4x4 conversion. Never had any trouble. Stock steel rims. No rubbing up front either.

 

I had been wondering about the 235 series.. How about under a load? And a good load too? (3500lbs or more in the bed).

 

I have not put mine under a load yet... but my 235/85/16s look so much better! no rubbing at all...

Even with a load it should be just fine, just gotta make sure they are aired up (which i do anyway for the load)



they will work much better once im 4x4 too, rather than 215s...

 

see MustangMatt, thats the trouble with putting 235's on (many,but not all, 2wd from the factory) dually rim's.
if you put even half payload on that truck your tires will be touching.
this causes heat and could cause a blow out.fyi.
there's a reason they come with 215's.
im running 225's on 2wd dually rims and that's getting close for comfort with around 3 tons in the bed.
iv decided rather than spacers,to switch to 215's.as the traction will be a little better,and i'l have the correct clearance.perhaps .1 -.3 mpg avg increase with 2" less tire width as well.
im just putting that out there.fair warning.


this load:


these rims and tires:
Accuride #28511
LT 225/75/R16 (29.3X8.9)

these results:


unacceptable and dangerous.