Tires - Load rating question.....

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FirefighterMTN

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I've looked, but can't find the answer, I promise!!


I've sold my 100 Series and am getting back in to a T4R after a year. Yes, I know....I shouldn't have sold my '14, but it was the height of the pandemic and I'm sure we all made some dumb decisions. :)


I had General Grabber ATx's on my "14 in the stock size. Absolutely loved them!! Great ride, awesome in rain and snow. Wonderful for the minimal off-roading I did.

I did the same for 100 Series, but went with 285's and had to get E load rating.

My question is that, I'm planning on going bigger with the new T4R, probably 285's as well, but am worried about the ride.

I'm asking on account that my 100 Series rode like dog crap around town. I know E load are heavier and stiffer, but could it have been my tired suspension and rickety bushings that made the ride suffer at slow speeds?

Does the ride suck that much more on E load on the T4R with stock suspension?
 
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I can't speak from experience, but I am 90% sure your ride will still be harsh regardless of what you do with suspension. higher load rated tires are harsh by design, some more than others
 
they'll be stiffer. you can run them in the 30-35 psi and itll help. The last 2 sets weve run e rated and if these coopers ever die the plan is C or even SL (Gasp

its not bad though. on stock suspension it wont be bad at all cause of how mushy the stock suspension is.
 
Humble Leader said:
I can't speak from experience, but I am 90% sure your ride will still be harsh regardless of what you do with suspension. higher load rated tires are harsh by design, some more than others
Click to expand...

Thanks! That makes sense and what I was figuring, but hoping wasn't entirely true!

I can go with a lower load rating with another tire in that size, but unfortunately, GG doesn't make an ATx in a non-E load rating in a 285.....from what I can find.
 
I got E load rated KO2s. They ride about the same as the original tires.

I do have a Rough Country leveling kit (spacers) so the springs and the shocks are OEM. Thus, no change in ride in that way.

I got the E load rating because I do a lot of off road on rocks and wanted the extra plys in the tires.

Personally, I like the soft ride in the 4Runner when going off road. Sure beats the really rough ride in he Wrangler that I had.
 
I think, like other have said, you'll find e rated tires to be a good bit harsher. Going bigger helps soften the ride some.

I've had 5 different sets of tires so far on my 5th gen. The best tires for highway ride and noise were P rated Goodyear ATS. I currently have E rated Cooper AT3s in 285/75/17 (the 34" size) and the extra height does help a bit. But they're definitely harsher than the OEM size in a p rated tire.

FWIW - a narrower tire will also offer more road dampening than a wider one all else equal. So a 255/80/17 will be smoother and tend to track better than a 285/70/17. If you need to go with an E rated tire, but want a better ride - I'd maybe look at that size if the tire you want is in that size. Or a 255/75/17. Or I'd consider a p285/70/17.

My experience with Toyo AT2s in the P285 was mixed at best. The tires were not round enough. They constantly had balance issues that were so bad that I went through 7 tires and discount tire ordered new ones again and they were so out of round that they couldn't be balanced - so Discount tire ended up refunding my money for the tires and swapped me out for the Cooper AT3s that have been pretty good so far. OTOH the toyos were pretty light weight, had really good traction in most conditions, and were pretty durable - I put a rock through the center of the tread once going fast in the desert. But they handled low speed rock crawling type trails well without any punctures or ripped sidewalls. If they balanced halfway decently, they'd have been one I'd recommend.
 
The deep tread on an all terrain E range can temporarily make up for the stiffness of the sidewall.

I went from a Goodyear AT/S 265/70R17 to a BFG KO2 265/70R17E and the ride got softer [emoji23]


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As you change from P rated to LT your pressure will go up. E I think raises it even more. The higher the tire pressure, the more shock is transmitted to you suspension and vehicle. Keep that in mind.
 
Jivewalker said:
As you change from P rated to LT your pressure will go up. E I think raises it even more. The higher the tire pressure, the more shock is transmitted to you suspension and vehicle. Keep that in mind.
Click to expand...


Going from C to E didn’t really change how much air I decided to put in. I still run 40-45 PSI. I wouldn’t run higher than this unless you’re towing in an F350, then you can start looking at 60 front / 80 rear with an E1 rated tire.

E2 have a max of 60 PSI, so says Discount Tire’s website.


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2021nightshade4x4 said:
Going from C to E didn’t really change how much air I decided to put in. I still run 40-45 PSI. I wouldn’t run higher than this unless you’re towing in an F350, then you can start looking at 60 front / 80 rear with an E1 rated tire.

E2 have a max of 60 PSI, so says Discount Tire’s website.


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Click to expand...

Here is a link to the proper way to determine psi:

How To Apply Tire Load Inflation Tables When Replacing Tires - TirePressure.com

And here is a link to a good thread on it:

Tire pressure for BFG KO2's
 
I have the E rated GG ATX 285s on my 2016. Rides just fine, and they perform VERY well. Best all terrain rain tire I've ever had.
 
I have 2 set of KO2 tires. One set is 275/70/17 load range E the other is 265/70/17 load range C. There is definitely a difference in ride with both at 36 psi. If you live in a place with smooth roads the e would be ok but I could not stand them on rough surfaces unless I ran them at 30-32 psi. When I went back to the stock size KO2 the ride, power and general driving experience was much better with the lighter load range C. When you first put on load range E tires you try to tell yourself it is not bad to justify your purchase but when you go back to load range C it makes the 4runner and me much happier.
 
Jivewalker said:
Here is a link to the proper way to determine psi:

How To Apply Tire Load Inflation Tables When Replacing Tires - TirePressure.com

And here is a link to a good thread on it:

Tire pressure for BFG KO2's
Click to expand...


I must admit, I didn’t know there were formulas and tables. I just knew my door sticker numbers probably went out the window once I changed both tire size and load rating.

I still need to read the second link, but I’m just going to copy the last line of the first article you sent, for posterity:

So proper tire inflation for new LT265/70R17 121S tires is 45 psi for front and rear.
Click to expand...

[emoji4][emoji4][emoji4]


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