F-150 20” wheels

StirCrazy wrote:

Grit dog wrote:
These last 2 posts are false, OP.
It’s not the tires and wheels increasing the capacity unless Ford “chose” to add higher rated tires to the 20s.
Actually in general if the tire OD is the same (unless the 20s are notably taller), the greater the rim diameter, the lesser the sidewall height and the lower the load rating.
And besides people are confusing gvwr, aka payload, with tow rating that is increasing the gcvwr considerably without a large or any payload increase.
My “guess” is the 2klb tow increase is from lower gearing and may have mis-read or it misprinted.

I think you need to learn what you talk about. in 2014 nd several other years the increased gvw package in my canse 11500 was only available with the 20" wheels and that was the only thing different from the 11000 gvw package. yes they are bigger 34.6" and rated higher, both rim and tire.

Steve

"people are confusing gvwr, aka payload, with tow rating"
That is both true and, arguably, false. Ford is increasing the tow rating without increasing the payload rating so the statement gets a true rating. However, the fact that 10 to 15% of the gross trailer weight should be put onto the truck means that in real life it is questionable. With the highest tow rating of 14,000lbs for the 2021 model that means that you should have 1,400 to 2,100lbs on the truck. That wipes out the payload rating even with nothing else in the cab or the bed of the truck. So there is a very valid argument that when you are using your crew cab pickup to haul the family and tow a camper on vacation you will exceed the gvwr before exceeding the Ford tow rating for the vehicle.

"My “guess” is the 2klb tow increase is from lower gearing"
This appears to be false. I can't find any new lower gear ratios in the 2021 build site. And even for previous years a higher tow rating could be achieved with 3.55 gears than the 3.73 gearset.

"the greater the rim diameter, the lesser the sidewall height and the lower the load rating"
This seems to apply more to the really low aspect ratio tires, lets say 40 and below. The factory tires for the 20" rims have a 60 aspect ratio and doing a little bit of research showed that the available tires for 20" rims and a 60 aspect ratio actually showed higher weight ratings than than the 18" tires for the same truck.