Tire Pressure recommendation (6 Viewers)

[Jabar]

I have quite good experiences with BFGKO2 on rocks (going down to 15psi - but it was 16inch tire in my LX450) so it is great to hear about Falken.
Duratracks also provided great grip (way better than KO2) just the sidewalls made out of baking paper...

 

[gaijin]

hiya folks,
plan to purchase new set of AT tires for LX570. The goal is to use stock 20"rims. Looking for info re. lowest (safety) pressure I can run on Wildpeak A/T3W 275/60/20_non LT or LT285/55/20- just wonder what is the best setup for rocky terrain (plan is White Rim and Elephant Hill in Canyonlands).
Is 18psi OK or risky for this tires? O know it is not the best tire for rocks - but need snowflake sign on it.

The RCTIP (Recommended Cold Tire Inflation Pressure for street use) for the 275/60R20 SL 115T tires on your LX570 is 30psi F/R.

The RCTIP for the LT285/55R20 Load Range E 122/119T tires on your LX570 is 43psi F/R.

I stand behind those two recommendations. The following, however, is just my opinion:

The 275/60R20 tires are a Standard Load 4-Ply rated tire. Personally, I would not choose this tire for aired-down use offroad. If, however, you do eventually choose this tire, and you have at least one (preferably two) spare(s) of the same size, and you must use it offroad, and must air down... I would not go below 22-25psi and I would take it easy - those sidewalls are paper thin.

The LT285/55R20 tires on the other hand, are a Load Range E 10-Ply rated tire - very suitable for aired-down offroad use. I agree with @TimCFJ40 above and would recommend a starting point for a reduced pressure of half the street pressure, or in this case, 22psi. Also as @TimCFJ40 stated above, for prolonged offroad speeds above 20mph or so, I would go a few psi higher.

HTH

 

[Jabar]

The RCTIP (Recommended Cold Tire Inflation Pressure for street use) for the 275/60R20 SL 115T tires on your LX570 is 30psi F/R.

The RCTIP for the LT285/55R20 Load Range E 122/119T tires on your LX570 is 43psi F/R.

I stand behind those two recommendations. The following, however, is just my opinion:

The 275/60R20 tires are a Standard Load 4-Ply rated tire. Personally, I would not choose this tire for aired-down use offroad. If, however, you do eventually choose this tire, and you have at least one (preferably two) spare(s) of the same size, and you must use it offroad, and must air down... I would not go below 22-25psi and I would take it easy - those sidewalls are paper thin.

The LT285/55R20 tires on the other hand, are a Load Range E 10-Ply rated tire - very suitable for aired-down offroad use. I agree with @TimCFJ40 above and would recommend a starting point for a reduced pressure of half the street pressure, or in this case, 22psi. Also as @TimCFJ40 stated above, for prolonged offroad speeds above 20mph or so, I would go a few psi higher.

HTH

thanks for quick response - I think LT tire is the way to go anyway, just tried to find size that is closest to 33" as the car is stock

 

[LCT]

@gaijin What’s the recommended tire pressure for Cooper Discoverer HT Plus in 285/50r20?
Thanks a bunch!

 

[gaijin]

@gaijin What’s the recommended tire pressure for Cooper Discoverer HT Plus in 285/50r20?
Thanks a bunch!

Beats me! Can you guess what additional info I need from you to make a recommendation?

 

[LCT]

Beats me! Can you guess what additional info I need from you to make a recommendation?

Sorry...it’s a M+S tire; Extra Load 116T on a LX570.

 

[gaijin]

@gaijin What’s the recommended tire pressure for Cooper Discoverer HT Plus in 285/50r20?
Thanks a bunch!

Sorry...it’s a M+S tire; Extra Load 116T on a LX570.

The RCTIP (Recommended Cold Tire Inflation Pressure) for the ISO-Metric 285/50R20 XL 116T Cooper Discoverer H/T Plus tires on your LX570 is 34psi F/R.

HTH

 

[1world1love]

Hi gaijin. First, I want to say how much I appreciate your input to the forum. I am changing my wheels and tires and I am wondering what my RCTIP will be. I have an LX570 and will be mounting BFG LT285 /75 R17 121S E1.

Thanks in advance.

 

[gaijin]

Hi gaijin. First, I want to say how much I appreciate your input to the forum. I am changing my wheels and tires and I am wondering what my RCTIP will be. I have an LX570 and will be mounting BFG LT285 /75 R17 121S E1.

Thanks in advance.

Thanks for the kind words

The RCTIP for the BFG LT285/75R17 tires on your LX570 is 35psi F/R.

HTH

 

[dubyahard]

My turn?

Hi @gaijin, I also want to say how much I appreciate your input to the forum. I did some research and math and figured I should be 36-38 RCTIP but thought I should ask the expert. I have an LX570 and have Nitto Ridge Grappler LT285/75R18 129/126Q E. Thank you!

 

[gaijin]

My turn?

Hi @gaijin, I also want to say how much I appreciate your input to the forum. I did some research and math and figured I should be 36-38 RCTIP but thought I should ask the expert. I have an LX570 and have Nitto Ridge Grappler LT285/75R18 129/126Q E. Thank you!

Your turn, sir!

The RCTIP for the LT285/75R18 E 129/126Q Nitto Ridge Grappler tires on your LX570 is 35psi F/R.

HTH

 

[TacomaLC]

Gaijin, I there a formula for this? I have 275/70 18 Michelin Defender LTX (E rated) and wondering

 

[gaijin]

Gaijin, I there a formula for this? I have 275/70 18 Michelin Defender LTX (E rated) and wondering

Of course there is. I've linked to the info several times, but here it is again: Toyo Guidelines for the Application of Load and Inflation Tables

The link is to a monograph published by Toyo Tires which explains the methodology for determining the correct inflation pressure for a non-stock tire size or type.

I'll give you the RCTIP for your use case, and then you can work through the calcs using the Guidelines and see if you can come up with the same answer.

The RCTIP for the LT275/70R18/E 125/122R Michelin Defender LTX tires on your 2019 LC200 is 41psi F/R.

HTH

 

[TacomaLC]

HTH, I thought you had posted this. I failed in m y search attempts. Thanks for reposting....You are patient and helpful and I appreciate both! Thank you!!

 

[gaijin]

HTH, I thought you had posted this. I failed in m y search attempts. Thanks for reposting....You are patient and helpful and I appreciate both! Thank you!!

Thanks for the kind words - you have earned much good Karma today

 

[radman]

@gaijin could you calculate the RCTIP for 305/70/18 on an LX?

discount tire is going to let me upgrade my 275/70's

 

[gaijin]

@gaijin could you calculate the RCTIP for 305/70/18 on an LX?

Yes I could, but you would have to tell me whether the tires are ISO-Metric, P-Metric or LT-Metric - and if ISO Metric, what the Load Rating is. Tire make and model is always helpful so I can double check whether you are asking for a tire that actually exists.

You have asked about an ISO-Metric 305/70R18 tire, but somehow I think I would be wasting my time if that is the tire I did the calcs for.

Waiting for your further info.

HTH

 

[radman]

Sorry! LT305/70R18 KO2s

 

[gaijin]

@gaijin could you calculate the RCTIP for 305/70/18 on an LX?

discount tire is going to let me upgrade my 275/70's

Sorry! LT305/70R18 KO2s

View attachment 2235618

The Recommended Cold Tire Inflation Pressure (RCTIP) for those LT305/70R18 KO2's on your LX570 is 35psi F/R.

HTH

 

[radman]

The Recommended Cold Tire Inflation Pressure (RCTIP) for those LT305/70R18 KO2's on your LX570 is 35psi F/R.

HTH

Thank you, kind sir!