Does anyone know if a 265/75/16 or a 285/75/16 tire will fit on my 03 f-350 dually 4x4 with stock rims without the need for spacers? Also, how will this affect my speedo? What can be done to fix this problem if so? Tired of all the big hole in fenderwell look with stock tires.THANKS FOR ANY HELP.

 

Thanks for any help..

 

shouldnt be a problem, and it shouldnt affect your speedo enough to worry about.

285 would be fine.

 

I run 285s even before the leveling kit... gonna run 315s pretty soon... oh, and we can tell how off your speedo is going to be, but we need to know what size came stock on your truck... if you go from a 245/75 to a 285/75, your speed will read about 11.3% slow, meaning if your speedo says 65mph, the cops radar sees you doing 72.5mph... really depends on the size you have right now...

Joey

 

On a DRW I wouldn't go over a 255 width if you don't want to run spacers.

255s on the rear duals won't touch when loaded.

 

oh.... dually... didn't pay attention to that part...

Joey

 

Thanks for the help guys...

 

I was running a 265/60R16 Firstone Steeltex whenI bought my truck and went to a 305/70R16 Nitto terra Grappler. They are great AT tires!
I then mounted those tires on a 16x9 American Racing Mojave rim
I have since bought some BFG AT KO's in a 315/70R17 as H2 takeoffs and put them on ProComp 17x10 rims

you should have no problem with a 265 or 285, I would even say a 305, if you feel like it
the F-350 sit high and I have no added lift on my 2002 F-350
GO FOR IT!!!!!

 

You running these on a DRW? ceopi has a DRW.

 

My bad, I didn't rear the whole post

 

Unfortunately I can't chime in on the dually part of it, but I run 315/70/17 BFG A/T's on my '06 F250. Everything is stock....stock rims, no lift, no nothing (although it does have the plow prep package which puts the front end up just a little). No rubbing or anything, even on a lock-lock turn.

 

How do you like those 315/70R17 BFG AT's?
I like them, they are def more aggressive than my Nitto Terra Grapplers
Although the Nittos were street friendly and better for the MPG, I wanted some tougher AT tires!

 

The 265/75R16 tire comes out to about 31.6" in height.
The 285/75R16 tire comes out to about 32.8" in height.

Just based on these height numbers, as I do not have each tire's revolutions per mile value, that comes out to a roughly 3.8% increase in height. That will corelate to an equal 3.8% variance in tire circumference. Which carries on to a 3.8% variance in the speedometer & odometer.

So, at a speedometer indicated 10 MPH, you will actually be traveling at 10.4 MPH. At a speedometer indicated 80 MPH, you will actually be traveling at 83.0 MPH.

It isn't a huge difference, but if you are one of the many folks that like to cruise at roughly 5 MPH over the speed limit, you could get yourself into trouble in that upper end (i.e. cruising 80 in a 75 would actually have you 8 MPH over the posted speed limit).


As for correcting this, you will need the "revolutions per mile" value from the tire manufacturer. This can be found within product literature, the company's web site, etc. Take this figure to a Ford dealership & get them to program it into the vehicle's computer.

Some dealerships are reluctant to do this. If you run into this, find another dealership. They will likely charge you for either 1/2 or a full labor hour at the shop's labor rate--generally around $70/hour.

 

If you use the tire manufacturer's site you can also calculate the width. Then I measured the distance between the existing duals. By subtraction you can see how much this distance will reduce. I went from 215 to 235 on my 2WD dually.

Going up to 265/75 or 285/75 might also require a wider rim. One of the web sites (maybe Discount Tire?) had a chart of the widest tire that fits a given rim width.

As posted above, don't cut it so close that they rub when the truck is loaded.