5th wheel towing with 20inch tires

[TLG]

Thinking about taking the plunge, but can't seem to find any Super Cab lariets within a 100 miles. Have located a few FX4's, but they all have the 20 inch tire option. It sure makes that rear end look high. Was wondering if anyone has installed a 5th wheel hitch in a 350 with the 20 inch tires. If so, how much adjustment did you have to do? Thanks

[smokyred]

The 20" wheels actually come with tires about the same height as the tires that come on the 18" wheels.

Dave

[MDarrough]

Right, overall diameter is very close.

[SmokeyWren]

Close, but still a difference.

F-250 Lariat 4x4 stock tires will be 275/70R18, 627 revs/mile, 33.2" diameter.

Optional 20s would be 275/65R20, 605 revs/mile, 34.1" diameter. That's almost an inch difference in diameter, and 3.5 percent difference in revs/mile.

Converted to something meaningful, when the F-250 with 18" tires was cruising at 1,900 RPM, the one with 20s would be cruising at 1,833 RPM at the same speed.

The static loaded radius of the 18" tire is 15.54". The static loaded radius of the 20" tire is 15.93". So with everything else being equal, the difference in the height of the top of the tailgate would be 0.39", or almost a half inch.

[scottbob99]

I tow a Sundowner 10' LQ trailer with my F350 with factory 20's. No problems, see picture.

Truck and Trailer picture

[SmokeyWren]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: scottbob99</div><div class="ubbcode-body">I tow a Sundowner 10' LQ ... </div></div>

Surely that's a typo? That looks like a forty footer to me. [img]/forums/images/%%GRAEMLIN_URL%%/wink.gif[/img]

[Hook'em Horns!]

That's one dang long 10 footer!

[scottbob99]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Hook_em_Horns</div><div class="ubbcode-body">That's one dang long 10 footer! </div></div>

It has a mid tack also, I left that out as most non horse people don't know what that is. It measeures 36.5' tip to tail!! [img]/forums/images/%%GRAEMLIN_URL%%/eek.gif[/img]

[SmokeyWren]

So now I assume you meant that the LQ part of the trailer is 10'. Most horse trailers with living quarters (LQ) have an 8' to 12' long LQ and the rest of the trailer is for tach room and horse stalls. Some have an even bigger LQ part of the trailer. Sundowner makes one with a 17' LQ, tripple axles and over 40' long. It requires a "real truck" to tow that one. [img]/forums/images/%%GRAEMLIN_URL%%/smile.gif[/img]

[96STROKE]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: TLG</div><div class="ubbcode-body">located a few FX4's, but they all have the 20 inch tire option. It sure makes that rear end look high. Was wondering if anyone has installed a 5th wheel hitch in a 350 with the 20 inch tires. If so, how much adjustment did you have to do? Thanks </div></div>

Man, I have NEVER seen a F350, or in fact any full size ford truck with 20" tires!!! [img]/forums/images/%%GRAEMLIN_URL%%/crazy.gif[/img] My work car has taller tires than that. [img]/forums/images/%%GRAEMLIN_URL%%/cool.gif[/img] 20" tires are bearly bigger than the brake rotors. I quess the plus side, is there would be next to no rubber, should be very cheap tires, exactly what load rating are these tiny 20's? And does this tire size option come with a very tall rear end gear ratio or is the top speed approx 38.5 MPH???

I would recomend going with 18" or 20" WHEELS and then 33"-35" TIRES. [img]/forums/images/%%GRAEMLIN_URL%%/grin.gif[/img]
[img]/forums/images/%%GRAEMLIN_URL%%/grin.gif[/img]

[Hook'em Horns!]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 96STROKE</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: TLG</div><div class="ubbcode-body">located a few FX4's, but they all have the 20 inch tire option. It sure makes that rear end look high. Was wondering if anyone has installed a 5th wheel hitch in a 350 with the 20 inch tires. If so, how much adjustment did you have to do? Thanks </div></div>

Man, I have NEVER seen a F350, or in fact any full size ford truck with 20" tires!!! [img]/forums/images/%%GRAEMLIN_URL%%/crazy.gif[/img] My work car has taller tires than that. [img]/forums/images/%%GRAEMLIN_URL%%/cool.gif[/img] 20" tires are bearly bigger than the brake rotors. I quess the plus side, is there would be next to no rubber, should be very cheap tires, exactly what load rating are these tiny 20's? And does this tire size option come with a very tall rear end gear ratio or is the top speed approx 38.5 MPH???

I would recomend going with 18" or 20" WHEELS and then 33"-35" TIRES. [img]/forums/images/%%GRAEMLIN_URL%%/grin.gif[/img]
[img]/forums/images/%%GRAEMLIN_URL%%/grin.gif[/img] </div></div>
How about some 22.5" Tires and Wheels:

[u2slow]

If they end up too tall.... have you thought to horse-trade at an autowrecker? Or just buy 17" take-offs? Maybe they will even swap them around at the dealer for you?

[Lightningfast01]

If it has factory 20's it probably has the light rear springs. I added air bags for a customer that hauled a 5er with 20's. The light rear leafs were losing the battle. I haul on 17's when I have the choice.

[1970Cyclone]

Do it..
2007 Designer, 2008 SRW F350

Pics

Makes the truck look small dont it??

[Old Mose]

I pull a 30' 5er w/no problems. Just hook it up & go.......and definitely get the 20's!