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Old 12-01-2006, 12:09 PM   #1
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Question Tires on the TV

My new TV came with P275/55 R20 Pirelli Scorpion ATR tires. The spare underneath however, is a P275/65 R18 (why would Ford do that?).

I love the look and ride of the R20's and they give me a little more ground clearance. I'm worried though how the ride and handling may change with the spare on. Also, do the 275/65 R18 tires provide more load capacity that the 275/55 R20 tires?

Would it be advisable to change the wheels and tires to all P275/65 R18's?
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Old 12-01-2006, 02:44 PM   #2
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Quote:
Originally Posted by rgodfrey
why would Ford do that?
hi rgodfrey and welcome to the forums...

to save money thats why!

the spare wheel is less expensive than those 20 inch wheels.

your spare is 0.2 inches larger diameter than the other 4....

this should have zero impact mechanically IF the spare is needed for duty.

the spare has 1 inch higher sidewall...7 vs 6. but is basically the same overall size because of the 2 inch wheel difference.

approx 1/2 inch circumfrence difference

the higher sidewall could in theory, have an impact on high speed cornering, and steering.

but in real world use...nada.

you'll have to sort out the load ratings on your own. the info is on the side wall of both tires....and the pirelli web site.

for a small trailer and urban life in a mild climate, the 20s work.

the 20s need more attention to balance and alignment and wear issues and proper inflation.

with a bigger trailer or rougher roads, off roads, winter travel...the 18s would be a better choice.

for cross country trips or life full tiime on the road, i'd prefer a more widely available and less expensive tire/wheel combo than the 20s...

but they are sweet looking...

i wish ford offered a 'lincoln mark' version of the superduty!

cheers
2air'
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Old 12-04-2006, 09:51 AM   #3
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Quote:
Originally Posted by 2airishuman
hi rgodfrey and welcome to the forums...

your spare is 0.2 inches larger diameter than the other 4....

approx 1/2 inch circumfrence difference

for cross country trips or life full tiime on the road, i'd prefer a more widely available and less expensive tire/wheel combo than the 20s...

cheers
2air'
Thanks for the analysis. I knew there was a way to figure the sizes out. It's interesting that the 18s are larger in diameter than the 20s. If I changed to 18s do you think there is anything that should be done to any other systems, e.g., speedometer? Or, would I just be going a little faster than the readout says?

On the sidewalls it says the max load of the 20s is 2403 lbs @ 44 p.s.i. for the 18s its 2601 lbs @ 44.p.s.i. On the "B Pillar" sticker it says with the 20s I have a CCW of 1472 lbs @ 35 p.s.i., so that would probably increase by few hundred pounds if we had 18s on the ground.

For most of our use, it seems the 20s would be okay (600# tounge weight, 300# passengers yields 500# of extra cargo), so I don't think CCW is a problem. However, your comment on having a less expensive, more widely available combination is a good one. We are planning on pulling from Florida to Alaska and back in 2008.

Maybe I'll contact the dealer. Perhaps there is someone who bought a Mark LT with the 18" chrome wheels who would like to swap.
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Old 12-04-2006, 10:26 AM   #4
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you are welcome...

assuming the speedo is accurate (my ford isn't) with the 18s, 60mph would really be...
60.3mph, about 0.5 mph error.

for a trip to alaska i'd absolutely go with a more rugged common arrangement.
use the spare sizing/fitment (18s) or even 17s with a higher sidewall and narrower foot print...

'denelllen' here has your tv...he lost all the tires (4) on one side at one time, this summer to nails/screws.
pm him for info...he winters in gator land too...
i'm pretty sure the hardest replacements to find were the truck tires....

for comparison the f-250s come with 18s or 17s, 265 widtth, but 70 series sidewalls....

there are several 'tire size calcultors' on line to help sort this out..google it.
i use the 'miata' one because the graphic views help too.

tirerack.com or 1010tire.com are helpful sites too...

as for finding 18s, take a look on ebay or some of the 'ford' forums....
plenty of the 18s available...


you've got plenty of time to sort this all out...

have fun planning the alaska adventure...
2air'

i see you are going to the 'can openers' rally...
i'll be there as will denellen...we can talk tires then....
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Old 12-04-2006, 10:29 AM   #5
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Tires on TV

Hi there Randy-

When we purchased our TV it didn't come with tires. There was a penguin on top of the teli but no tires.
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Old 12-04-2006, 10:59 AM   #6
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Okay- newby question here. What's a TV (other than the one I send too much time in front of)?
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Old 12-04-2006, 11:08 AM   #7
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I figured it out- Tow Vehicle. Yes??
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Old 12-04-2006, 11:20 AM   #8
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Quote:
Originally Posted by vonkamp
I figured it out- Tow Vehicle. Yes??
Yes, fellow newby. It took me by surprise when I first read it on another subject thread--couldn't see how what I was reading releated to the television .
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Old 12-04-2006, 12:04 PM   #9
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Does that mean there is a penguin on the Tahoe?
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Old 12-04-2006, 12:34 PM   #10
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Quote:
When we purchased our TV it didn't come with tires. There was a penguin on top of the teli but no tires.
Quote:
Does that mean there is a penguin on the Tahoe?
Now I'm thouroughly confused. So here's a picture of a rabbit with a pancake on it's head.
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Old 12-04-2006, 12:48 PM   #11
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Not a Rabbit

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Old 12-04-2006, 12:56 PM   #12
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Quote:
Originally Posted by vonkamp
Now I'm thouroughly confused. So here's a picture of a rabbit with a pancake on it's head.
ok now lets be careful tossing around that image.......

http://www.airforums.com/forums/193307-post9.html

by the way its a bunny...

also see posts 47/48 here...

http://www.airforums.com/forum...-21000-2.html?

not 2 mention you've completely hijacked this thread

for hijacking go here...

http://www.airforums.com/forum...ng-24723.html?

i see some real talent in this group....

cheers
2air'
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Old 12-04-2006, 01:45 PM   #13
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My apologies, someone sent that to me about a year ago. I thought it was original but I guess not. My bad..
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Old 12-04-2006, 01:50 PM   #14
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I love you "right-brained" types, but I was really trying to be serious. Next time I'll spell out Tow Vehicle if it will avoid the silliness. Thanks 2air for trying to bring this back.
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