Good Sam Club Open Roads Forum: 18" tire question - ANOTHER UPDATE
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 > 18" tire question - ANOTHER UPDATE

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Grit dog

Black Diamond, WA

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Posted: 08/12/21 08:15am Link  |  Quote  |  Print  |  Notify Moderator

specta wrote:

Grit dog wrote:

285 and 295 size get into the upper 3s and up to 4k.


[image]closest arvest bank

These are most likely what I'll be getting.
I just whish I didn't have to go soo tall. [emoticon]


Yeah that’s the one consideration for LT tires with high load ratings. Generally wider and taller aspect ratio.
Question is do you really want or need 4000lb tires?
Technically most all OE truck rims seem to be rated around 3500-3600 lbs when one can find that cryptic info. And you can get 3640lb tires in smaller 275-70-18.
Both of which are over 400lbs/tire better than the 17s ( presumably) that you’re running now with 3195lb rated tires ( and no issues).

Fwiw, I put a lot of miles with a 4000lb + camper on a shortbed truck sitting on 3640lb and 3750lb rated tires without tire issues.


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MORSNOW

Mountain Home, ID

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Posted: 08/12/21 08:37am Link  |  Quote  |  Print  |  Notify Moderator

All of the 4,000+ lb tires are too large to fit on the front fender of a Chevy/GMC without modifications. I like the idea of heavier rated tires, but the downside of fitment, odometer, gearing, and transmission calibration will keep me stock or close to stock.


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MitchF150

Puyallup, WA

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Posted: 08/12/21 09:29am Link  |  Quote  |  Print  |  Notify Moderator

Here is the size difference in those tires from stock.. I guessed on the stock size... [emoticon]

[image]

*Adjusted image size

* This post was edited 08/13/21 10:47am by an administrator/moderator *


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specta

utah

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Posted: 08/12/21 11:03am Link  |  Quote  |  Print  |  Notify Moderator

Thanks for all the replies.

I've decided to go with 275/65-18 because they are the closest to the factory diameter so they wont change my speedo or gearing and will still be rated closer to what I'm carrying.

zb39, I have no idea what the rims are rater for.

19.5 are not even a consideration.

I'm perfectly content with the tires that I have on my truck now. I've been wanting some nice factory take off aluminum wheels for a long time to replace the factory steel wheels that are on my truck now. I figured if I was buying different rims I might as well get 18s and up the load capacity of the tires.


Kenny
2011 Chevy 2500 HD 6.0L 4wd
1995 Lance 945 Onan QG 2500 LP
Regular cab. The best looking trucks.


d3500ram

Colorado

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Posted: 08/12/21 11:36am Link  |  Quote  |  Print  |  Notify Moderator

specta wrote:

...~snip...
I have no idea what the rims are rater for.
...~snip~...

When I went through the same exercise and analysis, I assumed that the stock rims are rated for at LEAST the LI of the tires that came on the truck from the factory. I had steel rims (not aluminum or any upgraded options.)

When I did the calcs, I was over 150# on the rear (75# per wheel over) and I was OK with that, further assuming that there was a factor of extra capacity of the steel wheels even if no published rating was available. Again, assuming the wheels were capable of at least the factory tires wrapped around them.

I went up one size on the tires and increased the LI from 121 to 126 so I had no concerns on tire capacity. This was on 17" rims, but perhaps the analogy may assist for similar in this 18" situation.


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Kayteg1

California > Nevada

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Posted: 08/12/21 12:13pm Link  |  Quote  |  Print  |  Notify Moderator

Factory has obligation to match rims ratings to axle ratings, when tires usually have more capacity.
My F450 was rated at 15,000 GWVR, when 6 tires added together gave it 26,000 lb.





specta

utah

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Posted: 08/12/21 02:06pm Link  |  Quote  |  Print  |  Notify Moderator

MitchF150 wrote:

Here is the size difference in those tires from stock.. I guessed on the stock size... [emoticon]


Thanks for the chart. I'm going to stay with tires as close to the factory diameter that I can. I don't mind a little wider I just don't want any taller. 10% diameter makes a lot of difference and so does weight.

JimK-NY

NY

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Posted: 08/13/21 06:14am Link  |  Quote  |  Print  |  Notify Moderator

specta wrote:



I have no idea what the rims are rater for.


I would find out pronto. The vast majority of fancy custom wheels are sold to trucker wantabes driving tricked out half ton trucks. They are rarely rated for the loads needed for a truck camper.

FireGuard

Frazier Park

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Posted: 08/13/21 10:01am Link  |  Quote  |  Print  |  Notify Moderator

Those are Factory Chevy wheels. I think you’ll be ok.


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joeshmoe

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Posted: 08/13/21 10:10am Link  |  Quote  |  Print  |  Notify Moderator

Look to be factory forged wheels. Probably 3500-3800 lbs. Look closer. You might find a max. weight rating. I know my 18s are stamped 3500 lbs.


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