Lots of discussion on tires, pressures and capacities as of late. And that got me thinking back to when I ordered the truck in my signature. I ordered “heavy duty service suspension”, 3.55 axle, and other options that set it with a 11,300 lb GVWR. Which made it a good SRW tow vehicle for our fifth wheel (which scales at 12,200 lbs). When I go back and look at the offering materials from when I ordered my truck I now see that the only difference between a 11,300 lb GVWR rating and a 11,500 lb GVWR rating (all other options being the same) seems to be the tires. I ordered mine with LT275/65R18 tires that have a 3,415 lb rating at 80 psi. The other 18” tire option available then was LT275/70R18 tires that have a 3,640 lb rating at 80 psi, which seems to move the GVWR to 11,500 lbs.

So, all other options being equal on a 2015 F-350 SRW truck are tires the only difference between these GVWR ratings?

 

Just the ratings on your truck versus your truck with different tires? I believe the answer is "yes".

Ratings overall on lots more trucks? No.

 

Thanks CathedralCub,

I’m only talking my truck with different tires.

 

I was fairly sure, but not 100%.

 

Just so you understand - regardless of what tires you install on your truck its' GVWR remains the same.
Once labeled by Ford it forever sticks.

 

Agree, good to clarify this.

 

Yep. That’s all true.

 

When I ordered my truck, there was a pretty good discussion going on of which tire and wheel combo ensured the highest GVWR. I paid close attention to that and ended up with the 11,500 rating. 18" wheels with the Goodyear AT tires.

 

The 2015 Specifications Brochure might be informative:

https://madocumentupload.marketingas...8bc83&v5=False

HTH,
Jim / crewzer

 

I'm unsure if you realized it but while ordering there was an option for a 14K GVWR.

 

Funny guy.

My SRW fits in the garage. A DRW wouldn't. People give me crap already for the "monster" truck I have now (that is completely stock).

 

That makes perfect sense ...
however you could park it outdoors (like I do).

To me it's just a tool, not a companion.

 

Jim isn't that because your in CO and everyone is hugging trees, smoking dope and driving EV with daisies hanging from the mirror.

 

We like to think that the tree huggers and pot heads are limited to Denver and Boulder. If it wasn't for those two cities, this would be a great state. My EV has never had flowers anywhere on it!

 

The rating of the tires is not the only factor here. The diameter of the tires directly affects the final reduction ratio of the truck which is also figured in to the GVWR.