[jonmacs22]

Ok. I just got an 08 dc Xsp with 305-50-20's and had to put new tires on. Where is the load rating on the tire? and my label in the truck says 32lbs.

Take a look at the side of the tire. In small print somewhere on the very inside edge, you will find wording such as "Maximum Load Capacity 2503lbs." this is the rating per tire. Another option is to go on the Tirerack.com site and look up the exact tire brand and size you have. Then once you have found it, click on the "Specs" link. The page will load and your tire specs should be right there at the top of the list.

Jon

 

[offthetrail]

Despite your statement to the contrary, you are actually damaging the tires. Load D/E tires are designed to have the support of 60-80psi internally. They are not meant to maintain such low pressures, hence placing unintended sidwall loads. You running the Load E at 37, is like running your OEM tires at 15-20psi.

I hope you change your perspective, for the safety of yourself and those around you.

This is an old thread, but thought I would add a little info since I am researching. I have a 2010 rock warrior, and it came with LT285/70-17 BFG all terrains that are load range E. The sticker in my door jamb from toyota says to run 40 psi front and rear. I think that toyota would recommend a safe pressure that would not damage the tire.

I am thinking of changing tires to regular passenger P285/70-17 so I can get 1-2 mpg more like the truck is rated for. Then I would need to lower my pressure.


I found this good post from a titan forum.

But if you select an E or D rated, light truck, (LT), remember to air up the tires before carrying a heavy load. If not, a passenger rated tire will have greater capacity than a D or an E, left at 35 or 40 psi. but even left there, probably would be o.k. unless you were exceeding the truck's maximum load capacity.

The stock Off Road Pkg. Rugged Trail P285/70/17 has 2833 lbs. maximum load rating at a 35 psi maximum inflation pressure. They must be derated for pickups and SUVs to 91%, so 2578 lbs at its maximum 35 psi.[2498 at 32 psi].

The aftermarket BFG AT KO, in this size is D-rated, LT285/70/17, and has a 3195 capacity at its maximum pressure of 65 psi. But if at 35 psi, the maximum load is only 2105 lbs.

BFG AT KO LT285/70/17 psi/load
35 psi ... 2105 lbs. max. load single tire
40 psi ... 2315 lbs.
45 psi ... 2510 lbs.
50 psi ... 2755 lbs.
55 psi ... 2890 lbs.
60 psi ... 3070 lbs.
65 psi ... 3195 lbs.

So for this LT285/70/17 to match the load capacity of the P-rated P285/70/17 of the same basic size, you would need to run somewhere between 45 and 50 psi in the LT285/70/17.

 

[chitown4x4]

Well here we can take a step further. Deciding on tires, close to the same size, one is D rated one is E rated. Pros and Cons of running E rated tires with 60 PSI in them?

Harsher ride? How are E rated tires work off road when you have to drop the PSI to 20lbs? for better traction?

 

[SP]

Why is 40psi high? The tire is rated for 80 psi

the tire is rated for that but from what I have read over the years and from my own experience you should run what it says on the door jam.

 

[TRENT310]

the tire is rated for that but from what I have read over the years and from my own experience you should run what it says on the door jam.

'cept the door jam sticker was designed for the original tires... if those are changed then they probably don't mean much anymore. It's like adding the supercharger and then saying well I used to run regular grade gas in it so I can still do that...

 

[CMAXon22's]

im at 65 psi all the way around. And true^^^ that sticker in the door means S*** when your running any kind of after market tire, especially load range E

 

[santaclause]

I just had a set of mastercraft courser Ats put on Load range Es and they set them at 50psi they said jack up to 65 when towing the camper so my truck does ride harsher in a way but also I think it handles a little better hoping so in the snow the stock TRD tires are junk as far as I am concerned ........

 

[SP]

'cept the door jam sticker was designed for the original tires... if those are changed then they probably don't mean much anymore. It's like adding the supercharger and then saying well I used to run regular grade gas in it so I can still do that...

Yeah I understand its tire with a different rating. But dosent the truck weight have to do with the PSI that you should inflate the tire too? for example. If the truck was 12k vs 6k you would need more PSI in the tire to support the extra weight.

I had D or E rated BFG AT's on my 06 tacoma and I had a hard time finding the right PSI untill I used the 32/35 PSI.

 

[tonyspin]

Yeah I understand its tire with a different rating. But dosent the truck weight have to do with the PSI that you should inflate the tire too? for example. If the truck was 12k vs 6k you would need more PSI in the tire to support the extra weight.

I had D or E rated BFG AT's on my 06 tacoma and I had a hard time finding the right PSI untill I used the 32/35 PSI.

Shawn, this is what Bill from Warren Tire says:

Give Me A Tire Problem - Page 20 -

 

[volleyball]

Doing a little research on tpms and I found that the wheel sensors are only rated for 65psi max.
I would suggest anyone running more to put the sensors on bands and install high pressure truck valve stems, the ones with the nuts.

That Titan forum info was good for reference but does not directly apply for tundras. load d on a smaller truck vs load e on a tundra.

 

[Deuce Niner]

I run 38 f/r in my Michelin LTX AT2's (E) when not towing....I've found they ride like sh*t on SoCal freeways at anything over 40. When towing at almost 12k lbs fully loaded, I max out the rear at 80 and run 65 front....rides like butta baby.

 

[TRENT310]

Doing a little research on tpms and I found that the wheel sensors are only rated for 65psi max.
I would suggest anyone running more to put the sensors on bands and install high pressure truck valve stems, the ones with the nuts.

That Titan forum info was good for reference but does not directly apply for tundras. load d on a smaller truck vs load e on a tundra.

Aren't the TPMS valve stems all metal anyway?

 

[dryfly]

I just had my dealer install 4 new Michelin LTX AT2 stock size E range...
The tech put 33 in the fronts and 31 in the backs !!!!!!

I immediately aired them all up to 40....now I am wondering if I should bump them up to 45 or 50???

 

[ebenke]

I just had my dealer install 4 new Michelin LTX AT2 stock size E range...
The tech put 33 in the fronts and 31 in the backs !!!!!!

I immediately aired them all up to 40....now I am wondering if I should bump them up to 45 or 50???

I'm running the same Michelin tires, sized at 275/65/18. I'm running them at about 45/43 and I'll air up the rears to if it's loaded down.

I posted over a year ago to follow the mfr's door sticker info, but as other's have mentioned this table is only for the stock size and type tire, so different tactics apply to different tires.

It seems more logical to set the air pressure within the range of what's stamped on the tire, while considering the weight of your specific vehicle, and whether or not your hauling a heavy load.

 

[dryfly]

So after just spending buku money and reading this thread I decided to call Michelin today.
The Michelin tech said 50 all the way around with empty bed and not towing.
Holy crap the dealer set them at 33 when I bought them !!!
I aired them up to 40...then I aired them up to 46 this morning after reading this thread again.
Guess I will air up all 4 to 50 and see how I like.

Hell I read every review on every tire everywhere and ended up with what I originally intended to purchase....LTX AT2's.
I am curious to see how they perform this winter here in the White Mountains of NH....and moose hunt is only 10 days away too!

My questions are is there a big diff between 46 and 50?
Is there a way to tell by looking at the tire what is best range of PSI ?

Thanks again!

 

[ebenke]

So after just spending buku money and reading this thread I decided to call Michelin today.
The Michelin tech said 50 all the way around with empty bed and not towing.
Holy crap the dealer set them at 33 when I bought them !!!
I aired them up to 40...then I aired them up to 46 this morning after reading this thread again.
Guess I will air up all 4 to 50 and see how I like.

Hell I read every review on every tire everywhere and ended up with what I originally intended to purchase....LTX AT2's.
I am curious to see how they perform this winter here in the White Mountains of NH....and moose hunt is only 10 days away too!

My questions are is there a big diff between 46 and 50?
Is there a way to tell by looking at the tire what is best range of PSI ?

Thanks again!

At 50psi, the ride is going to be very, very noticably different. I run about 43-45psi and the rides already much more harsh than stock...

PS - The AT2's have been great tires so far. I've got 30k miles so far and they are wearing nice and even, traction is very good as well.

 

[Sabre01]

Quote:
Originally Posted by tonyspin
Bill, what minimum pressure do you recomend for a E rated tire? I was reading a thread on another forum and some guys were saying they run what it says on the door plate. I never go below 50psi, even when unloaded. I did notice that when I take my truck to the dealer for one of my free oil changes, they air them down to 34psi.
Your dealer may not realize you have 10 ply tires.
I wouldn't run under 50psi. It your truck is handling good and your tread wear is even, I wouldn't touch it.
Under inflation will cause the tire to deflect more than it was designed for. It most likely wouldn't cause a problem today or tomorrow, but long term it will cause rapid tread wear, irregular wear and could cause casing failure.

On the other hand
When a tire has too much air you see the center wear more, what most don't realize is that you are only riding on the center of the tread, Even though the whole bottom of the tread appears to be grounded.
Over inflation also causes tread squirm on newer tires. The tread is deep and only 2/3 of it is firmly grounded. Because all tires are a little different, 50 may work for you and 60 may work for other brands.
Sorry, Sometimes I can't stop.

 

[Sabre01]

As I read through thread, I found this, ^^^ so I put it in here again. My Tire Dealer here in NH , and Toyo both recommended 50 psi for my E-rated 10 ply Tires (LT275/70x18 TOYO Open Country A/T's) . Also the guy above^, Bill, I believe, is a Tire guy too. My experience has been to listen to pros, and underinflated tires are never a good Idea. My truck rides a bit stiffer,as I figured it would, but it's the trade-off for an Awesome Tire that does and looks like I wanted it to. I did have my Toyota dealer re-flash my TPMS module and that took care of my TPMS light, he said it will now 'recognize' the higher pressure as normal. I'm happy. And the Tires are quiet on the road .

 

[tonyspin]

I did have my Toyota dealer re-flash my TPMS module and that took care of my TPMS light, he said it will now 'recognize' the higher pressure as normal.

TPMS module does not have to be "re-flashed", and I don't believe that is even possible. All that is required is a reset with the button under the dash.

 

[Sabre01]

TPMS module does not have to be "re-flashed", and I don't believe that is even possible. All that is required is a reset with the button under the dash.

I didn't think so either, but the light stayed on after doing the reset twice, my tire guy couldn't get it to go off either. I called the dealer, he said bring it in. They hooked up the Scan tool, read the code and cleared and he told me that he had to re-flash... I dunno, they did look at the spare too... maybe that was another issue as I believe there is one in the spare too...and it doesn't run the same pressure as other 4. as it's original...they were cool about it, it's a used truck and they didn't charge, so no bit*% from me.