Tire Pressure recommendation (24 Viewers)

[gaijin]

Gaijin, I bought new tires for my LX
BFG Mud Terrain KM3 LT295 /70 R17 121Q E1 RBL. What psi please.

The RCTIP for those LT295/70R17/E 121/118Q tires on your LX570 is 35psi F/R.

HTH

 

[Vestal]

The RCTIP for those LT295/70R17/E 121/118Q tires on your LX570 is 35psi F/R.

HTH

Gaijin, sorry to pile on, but could you pass along your psi expertise on my DEFENDER LTX M/S E 275/70/r18's?

I've been playing with different highway values but have become a victim of brain-fog due the subtle variations.

 

[gaijin]

Gaijin, sorry to pile on, but could you pass along your psi expertise on my DEFENDER LTX M/S E 275/70/r18's?

I've been playing with different highway values but have become a victim of brain-fog due the subtle variations.

No problem - it's what I do

Assuming these are going on your 2020 LC200, and assuming you mean the LT275/70R18/E 125/122R tires, then:

The RCTIP for those LT275/70R18/E 125/122R tires on your LC200 is 41psi F/R.

If either of my assumptions is incorrect, post back with the correct info and I'll give you a suitable recommendation.

HTH

 

[Vestal]

No problem - it's what I do

Assuming these are going on your 2020 LC200, and assuming you mean the LT275/70R18/E 125/122R tires, then:

The RCTIP for those LT275/70R18/E 125/122R tires on your LC200 is 41psi F/R.

If either of my assumptions is incorrect, post back with the correct info and I'll give you a suitable recommendation.

HTH

Your assumptions are correct, as usual.
Thank you, sir!

 

[omar rva]

@gaijin I think I'm messing up my understanding of the load inflation calcs and could use some assistance...

I have a 2019 stock LC 200. I got rid of the factory Dunlops, (285/60/r18, 116V; I believe this to be the factory size, but I didn't take a pic of the tire before disposing) and replaced with 285/60/r18, 120s XL Toyo Open Country AT IIIs. I used the ISO Metric table reference since neither have a "P" designation.

The factory door card states 33psi front and rear on the stock size. Using the ISO tables that tells me to use a reference load of 2579. This equates to 29PSI for the 120 rated tire. Is this right? Just feels odd to "under inflate" compared to the stock tire.

Thanks in advance!

OA

 

[gaijin]

@gaijin I think I'm messing up my understanding of the load inflation calcs and could use some assistance...

I have a 2019 stock LC 200. I got rid of the factory Dunlops, (285/60/r18, 116V; I believe this to be the factory size, but I didn't take a pic of the tire before disposing) and replaced with 285/60/r18, 120s XL Toyo Open Country AT IIIs. I used the ISO Metric table reference since neither have a "P" designation.

The factory door card states 33psi front and rear on the stock size. Using the ISO tables that tells me to use a reference load of 2579. This equates to 29PSI for the 120 rated tire. Is this right? Just feels odd to "under inflate" compared to the stock tire.

Thanks in advance!

OA

Good question, you're very close.

Since your stock tires were SL (Standard Load) ISO-Metric tires, you should use the Standard Load ISO-Metric tables to find the required load @33psi.

But your new Toyo's are XL (Extra Load, or Reinforced) tires, so you should be using the Reinforced Load ISO-Metric tables to find the desired psi to support the required load you found for your stock tires.

Follow that process and you will find that your new tires should also be inflated to 33psi.

HTH

 

[omar rva]

Good question, you're very close.

Since your stock tires were SL (Standard Load) ISO-Metric tires, you should use the Standard Load ISO-Metric tables to find the required load @33psi.

But your new Toyo's are XL (Extra Load, or Reinforced) tires, so you should be using the Reinforced Load ISO-Metric tables to find the desired psi to support the required load you found for your stock tires.

Follow that process and you will find that your new tires should also be inflated to 33psi.

HTH

Awesome. Thanks for the correction!

OA

 

[Lion2008]

KO2 LT285 /70 R17 116S C1 BSW looking for LC200 cold tire pressure. Anyone running load C?​

 

[gaijin]

KO2 LT285 /70 R17 116S C1 BSW looking for LC200 cold tire pressure. Anyone running load C?​

Same pressure for C, D or E.

The RCTIP for any LT285/70R17 tire on your LC200 is 40psi F/R.

HTH

 

[Lion2008]

Same pressure for C, D or E.

The RCTIP for any LT285/70R17 tire on your LC200 is 40psi F/R.

HTH

Thanks Gaijin

 

[NYC570]

I just got Toyo open country a/t iii in P285/70/17 117T for my 13LX. I know that the RCTIP is 26psi but that seems very low and the tires look bulged. Also, contrary to what's supposed to happen, they seem to ride better at higher PSI but I have to test this more since I just got them. I came from km2 mud terrains and even though the Toyos are smoother, the mud terrains appear to take potholes better from my limited driving.

 

[gaijin]

I just got Toyo open country a/t iii in P285/70/17 117T for my 13LX. I know that the RCTIP is 26psi but that seems very low and the tires look bulged. Also, contrary to what's supposed to happen, they seem to ride better at higher PSI but I have to test this more since I just got them. I came from km2 mud terrains and even though the Toyos are smoother, the mud terrains appear to take potholes better from my limited driving.

The only two sizes currently available for 17" KM2's are LT255/75R17/C 111/108Q and LT255/80R17/E 121/118Q.

The LT255/75R17/C 111/108Q tires would have a RCTIP on your LX570 of 42psi, and the LT255/80R17E 121/118Q tires would have a RCTIP of 40psi.

I can understand how you are observing a much different ride with P-Metric tires @26psi compared to LT-Metric tires at 40-42psi, but that is the nature of the beasts.

My guess is you would be much happier with the LT285/70R17 Toyo Open Country A/TIII tires at the RCTIP of 35psi on your LX570 and ditch the P-Metric tires.

HTH

 

[NYC570]

The only two sizes currently available for 17" KM2's are LT255/75R17/C 111/108Q and LT255/80R17/E 121/118Q.

The LT255/75R17/C 111/108Q tires would have a RCTIP on your LX570 of 42psi, and the LT255/80R17E 121/118Q tires would have a RCTIP of 40psi.

I can understand how you are observing a much different ride with P-Metric tires @26psi compared to LT-Metric tires at 40-42psi, but that is the nature of the beasts.

My guess is you would be much happier with the LT285/70R17 Toyo Open Country A/TIII tires at the RCTIP of 35psi on your LX570 and ditch the P-Metric tires.

HTH

My km2 are 285/70/17 just like my toyos. I'm happy with the toyos, I just thought that they'd take potholes better. I'm still playing with pressures though.

 

[supercarrera]

Hi @gaijin do you have a number for Falken Wildpeak AT3W LT315/70r17? Thanks

 

[gaijin]

Hi @gaijin do you have a number for Falken Wildpeak AT3W LT315/70r17? Thanks

If they are going to be mounted on your LX570, then I do have a number:

The RCTIP for those LT315/70R17/E 121/118S tires on your LX570 is 35psi F/R.

HTH

 

[Ratchey]

@gaijin Can you tell me the recommended pressure for the Toyo AT3 LT285/75R17 117/114Q C on Rock Warriors on a Lexus LX570?
I appreciate it.
Thanks

 

[TeCKis300]

I've been reading a lot on cold tire pressure and their conversion to a different size and tire type. I found something I would like to consider.

Stock LX570 - 285/50R20 recommended pressure is 33 psi
Stock LC200 - 285/60R18 recommended pressure is 33 psi

If both vehicles have the same gross vehicle mass, can I use the LX570 recommended pressure as basis of computation for my new LT285/65R18 recommended pressure for a more softer ride which is 37 psi? (42psi if I would base my computation from the LC200 recommended pressure)

^This guy gets it. Absolutely spot on.

LC owners should really consider the opportunity for a better ride.

 

[iqbal624]

What is the recommended tire pressure for a 2015 LC with 400-500 lbs of additional weight on 285-75-17 E load Falken Wildpeak AT3W’s.
thank you!

 

[jsttry]

Wow impressive thread @gaijin ill ask mine too

285/70/27 maxxis razr on an Aussie 200 weighing in around 3.3T

 

[TheEvilPrince]

Me too. Going to pull the trigger soon and should be prepared.

2017 LX with 18" Tundra wheels.
And Toyo Open Country AT3

• LT275/70R18 125/122S E
• UTQG: None
• Style: Blackwall

Thank you very much in advance. I assume it is somewhere around 41 psi?