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Open Roads Forum  >  Tow Vehicles

 > F-150 20” wheels

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Grit dog

Black Diamond, WA

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Posted: 10/29/20 09:31am Link  |  Quote  |  Print  |  Notify Moderator

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.


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rmnpcolorado

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Posted: 10/29/20 04:53pm Link  |  Quote  |  Print  |  Notify Moderator

mkirsch wrote:

It would be easy to determine by going to a lot and looking, that the load rating of the 20" tires is higher than that of the 16"/17"/18" options.

One would think that, but there’s a dealer I peruse that posts a picture of the labels and it’s not the case. There doesn’t seem to be much of a rhyme or reason as I tend to peruse the same type of trucks, all similarly equipped, all with the 7000#payload package as the window stickers say and they’re all different. 18s or 20s, who knows.

I was talking to a dealer and had him snap a picture of the label. It came back as 1,651lbs with the 18s. It seems like 1,800 is common, but so is anything below.


2020 Ford F-150 3.5L w/Max Tow
2011 Jayco X213

JIMNLIN

Oklahoma

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Posted: 10/29/20 06:39pm Link  |  Quote  |  Print  |  Notify Moderator

Looking at 2020 fleet ford specs show the 18" X 7.5" wheels are OEM on the F150HDPP. The specs also shows the 20"X 8" wheels have less capacity than the 18". These are all 6 lug wheels.
Can the F150HDPP with its 4800 rawr be had with 20" wheels (2026 lb rating per Ford specs). Granted the tires may have enough capacity but the wheel requires at least a 2400 lb rating to be used with the HDPPs 4800 RAWR.


"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers

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mooky stinks

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Posted: 10/29/20 07:13pm Link  |  Quote  |  Print  |  Notify Moderator

The hdpp only comes with 18" wheels which makes this even more confusing.


2020 F150 XL Screw 4x4 6.5”box
3.5 ecoboost Max tow HDPP
7850 GVW. 4800 RAWR
2565 payload

2020 Cougar 29RKS 5th wheel
9600lbs scaled

BB_TX

McKinney, Texas

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Posted: 10/31/20 10:35am Link  |  Quote  |  Print  |  Notify Moderator

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.
....

Sorry, not true for all tires. Look at the specs for the Michelin LTX A/T2 tires in LT275/65R18 and LT275/65R20. The 18" tire has a max load rating of 3,415 lbs at 80 psi. The 20' tire has a max load rating of 3,750 lbs at 80 psi. That is 335 lbs more per tire than the 18".

Similarly, the LT245/75R16 tire has a lower rating than the LT245/75R17.

Similar Continental tires have the same load ratings as above for the same sizes.

Don't know about other brands or styles.

Michelin

Grit dog

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Posted: 10/31/20 10:48am Link  |  Quote  |  Print  |  Notify Moderator

BB_TX 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.
....

Sorry, not true for all tires. Look at the specs for the Michelin LTX A/T2 tires in LT275/65R18 and LT275/65R20. The 18" tire has a max load rating of 3,415 lbs at 80 psi. The 20' tire has a max load rating of 3,750 lbs at 80 psi. That is 335 lbs more per tire than the 18".

Similarly, the LT245/75R16 tire has a lower rating than the LT245/75R17.

Similar Continental tires have the same load ratings as above for the same sizes.

Don't know about other brands or styles.

Michelin


That’s because they’re not the same height tires. The 20s are 2” taller than the 18s. They have the same sidewall height and greater OD thus more capacity.
I said same diameter tires. Same for the 16 vs 17 example.

Facts. And it’s more about physics than tire construction or brand. Same tire construction, greater width, sidewall, OD generally have greater capacity.

Groover

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Posted: 10/31/20 12:04pm Link  |  Quote  |  Print  |  Notify Moderator

JIMNLIN wrote:

Looking at 2020 fleet ford specs show the 18" X 7.5" wheels are OEM on the F150HDPP. The specs also shows the 20"X 8" wheels have less capacity than the 18". These are all 6 lug wheels.
Can the F150HDPP with its 4800 rawr be had with 20" wheels (2026 lb rating per Ford specs). Granted the tires may have enough capacity but the wheel requires at least a 2400 lb rating to be used with the HDPPs 4800 RAWR.


HDPP can only be had with 18" wheels through the 2020 model but changes for the 2021 model. Some combinations seem to be available with the 20" wheels. I just built a Lariat hybrid and it shows the 3.73 axle which goes with Max Payload and 20" wheels. No LT tires though. So if you are considering 2021 model things are changing.

Lariat, SuperCrew®, 6-1/2' Box, 3.5L Power boost™ Full Hybrid V6 Engine, HEV Electronic Ten-Speed Automatic Transmission with Selectable Drive Modes, 4x4, 3.73 Electronic Locking Axle Ratio $51,945
Edit
PaintS4
Antimatter Blue$0
No Secondary Color$0
Edit
PackagesS4
502A High$6,920
Max Trailer Tow Package$1,350
275/60 R20 OWL All-Terrain Tires (A/T) (4x4)$0
Exterior S4
20" Chrome-Like PVD Wheels $1,395

riven1950

NC

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Posted: 10/31/20 12:06pm Link  |  Quote  |  Print  |  Notify Moderator

Our 2018 ECO CC XLT max tow was totaled is Sept during a hurricane. I had LT Michelens on it . Tires were 18 inch.

We replaced the truck with exactly same truck, 2020. The 2020 has 20 inch tires, which I was not really excited about at first. The tires are stock OE ford tires. I really have changed my mind and love the look and ride of the 20 inch tires. Have not been able to tow with it yet due to illness, but i'm betting the 20's will tow better.

StirCrazy

Kamloops, BC, Canada

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Posted: 11/02/20 05:54am Link  |  Quote  |  Print  |  Notify Moderator

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


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Groover

Pulaski, TN

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Posted: 11/02/20 06:37am Link  |  Quote  |  Print  |  Notify Moderator

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.

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