New Hankook tires pressure???

[GLO]

Hi guys,
yesterday I installed a new set of tires on my 5th generation 4Runner.
I have now these Hankook DynaPro AT'M RF10, size LT245/70R17, load range is E (10PR).
Toyota suggests to put 29PSI by default on the 4Runner tires, but the new tires look pretty deflated at that pressure. So I went to 32PSI, but still they do not look really OK. I am quite confused since I do not understand if the tires needs more inflation.
As anyone some experience with these tires on a 4Runner?
Many thanks!!!
Gianluca

 

[Mytoy4]

I had mine set as 32 as well (Don't have Dynapro on anymore tho). Here's a thread that I had started a while back when I had questions.

http://www.toyota-4runner.org/4th-gen-t4rs/123545-setting-psi-correctly.html

 

[oljedi11950]

tire pressure

Also check out Blackworksinc has a good write up on Lt verses P rated , I keep mine @ 45 psi

 

[JB.]

Hi guys,
yesterday I installed a new set of tires on my 5th generation 4Runner.
I have now these Hankook DynaPro AT'M RF10, size LT245/70R17, load range is E (10PR).
Toyota suggests to put 29PSI by default on the 4Runner tires, but the new tires look pretty deflated at that pressure. So I went to 32PSI, but still they do not look really OK. I am quite confused since I do not understand if the tires needs more inflation.
As anyone some experience with these tires on a 4Runner?
Many thanks!!!
Gianluca

29psi is almost criminally bad advice. They couldn't even handle Gross Vehicle Weight at that pressure, let alone allow for at least 20% load reserve.

In order to match the load capacity of the stock P265/70/17 tire at 32psi, the LT245/70R17 would need 50psi. The brand doesn't matter.

There's a lot of load reserve in those pressures, though, so you don't necessarily have to go that high if you don't want to. If it were me, I'd run at least 40psi.

http://www.toyota-4runner.org/general-discussions/110299-lt-tires-need-more-air-pressure.html

 

[GLO]

29psi is almost criminally bad advice. They couldn't even handle Gross Vehicle Weight at that pressure, let alone allow for at least 20% load reserve.

In order to match the load capacity of the stock P265/70/17 tire at 32psi, the LT245/70R17 would need 50psi. The brand doesn't matter.

There's a lot of load reserve in those pressures, though, so you don't necessarily have to go that high if you don't want to. If it were me, I'd run at least 40psi.

http://www.toyota-4runner.org/general-discussions/110299-lt-tires-need-more-air-pressure.html

Thank you very much for your answers!
You have to know that I live in Chile, where the 4Runner SR5 4x4 is equipped with 245/70R17, indeed I was guessing why is that so, since I just realized that it is equipped with 265/70R17 in the US.
So I just changed the original tires for AT tires having the same size. I am now EXTREMELY confused !!! What could happen to the 4Runner general performance/safety/driving???

 

[JB.]

Thank you very much for your answers!
You have to know that I live in Chile, where the 4Runner SR5 4x4 is equipped with 245/70R17, indeed I was guessing why is that so, since I just realized that it is equipped with 265/70R17 in the US.
So I just changed the original tires for AT tires having the same size. I am now EXTREMELY confused !!! What could happen to the 4Runner general performance/safety/driving???

The confusion comes from the fact that we're talking about 2 different tire types that are not interchangeable without a pressure adjustment (LT needs more pressure). Often you can make the switch without adjusting pressure because the original passenger tire has so much load reserve that the new LT of the same size will still have load reserve even though its load capacity is lower. In the case of 245/70/17 or P245/70/17 (same thing) there is not enough load reserve to allow a switch to LT245/70/17 without adding pressure.

Don't confuse AT with LT. AT refers to tread pattern and can be a passenger tire or an LT tire.

So just add some pressure. I'd go 35psi minimum. You don't want to cut it so fine that you're right at zero load reserve at gross vehicle weight.

What could happen with inadequate pressure is eventual tire failure.

 

[GLO]

Hi guys,
so I put the tires at 45 psi and went off-road today. Well, there was too much sideslipping even at 25 mph. So I went down to 40 psi and it was much much better. On the door's sidewall it is recommended 29 psi for the common tires, thus I do not think that the LT I have mounted would need more than 40 psi, or even 39 psi.
Thanks for your time!
G.

 

[JB.]

Hi guys,
so I put the tires at 45 psi and went off-road today. Well, there was too much sideslipping even at 25 mph. So I went down to 40 psi and it was much much better. On the door's sidewall it is recommended 29 psi for the common tires, thus I do not think that the LT I have mounted would need more than 40 psi, or even 39 psi.
Thanks for your time!
G.

Different story off-road. By all means go to 29 and enjoy the comfort and traction. Perhaps even as low as 25psi. But if the tires are also being used at highway speeds without a change in pressure, then 35 minimum.