Tire Pressure recommendation (5 Viewers)

[iijchenii]

Thank you!

 

[Dunbar]

1. Yes. The RCTIP for ALL LT285/65R18 tires on the LC200 is 42psi F/R.

2. In my opinion (and there are many extant on this forum), if you can comfortably travel offroad at or above about 30mph, there is no need to reduce tire pressure. However, if you want to air down at slower speeds, or just because you want to, my rule of thumb is to air down to 1/2 (half) your RCTIP - in your case, that would be 21psi. Your personal experience and preference would guide you to pressures above or below that starting pressure of 21psi.

3. Yes! By all means re-inflate to 42psi when steady travel is possible above about 30mph. Don't forget to re-adjust RCTIP when tires are cold - preferably after sitting overnight.

Please bear in mind that when aired down, any sudden shock to the tire - like a rock, curb, branch, etc. - if struck at speed faster than a crawl, could easily result in tire failure. The key for aired down travel is slow and steady.

HTH

I saw @gaijin asking specifics on the tire and vehicle in many posts and discussion of Load Rating. Searching specific tire sizes in this thread using the MUD search or Google is rather difficult. With the post above I figured, "that's it, 42psi". But it is not load rating specific so in the interest of bumping this thread to the top I shake the 8 ball and ask:
Cooper Discoverer AT3 XLT E1 RCTIP?
Discount put 45psi front and rear.

 

[gaijin]

I saw @gaijin asking specifics on the tire and vehicle in many posts and discussion of Load Rating. Searching specific tire sizes in this thread using the MUD search or Google is rather difficult. With the post above I figured, "that's it, 42psi". But it is not load rating specific so in the interest of bumping this thread to the top I shake the 8 ball and ask:
Cooper Discoverer AT3 XLT E1 RCTIP?
Discount put 45psi front and rear.

I don't know how I could have been more specific - ALL tires of a given size have the same RCTIP. In the context of my answer above, that means that ALL LT285/65R18 tires, no matter the manufacturer or the Load Range (C, D, E or F - ALL the same), when installed on a LC200 the RCTIP is 42psi.

You didn't state specifically what size tire you are asking about, but if the size is LT285/65R18, and if they will be installed on your 2020 LC200, then yes, the RCTIP is the same - 42psi F/R.

HTH

 

[AnyMal]

I saw @gaijin asking specifics on the tire and vehicle in many posts and discussion of Load Rating. Searching specific tire sizes in this thread using the MUD search or Google is rather difficult. With the post above I figured, "that's it, 42psi". But it is not load rating specific so in the interest of bumping this thread to the top I shake the 8 ball and ask:
Cooper Discoverer AT3 XLT E1 RCTIP?
Discount put 45psi front and rear.

Maybe you are confused.
Load “range” or rating is not indicative of actual carrying capacity of that particular tire. It’s indicative of max pressure more than anything else and an antiquated ply rating equivalent. It is a classification system to put it loosely.

Load index however is a what you are trying to say, and that is specific to each tire and size (it can vary) and what a pressure is based off of for a given load.

does that make more sense?

 

[gaijin]

Maybe you are confused.
Load “range” or rating is not indicative of actual carrying capacity of that particular tire. It’s indicative of max pressure more than anything else and an antiquated ply rating equivalent. It is a classification system to put it loosely.

Load index however is a what you are trying to say, and that is specific to each tire and size (it can vary) and what a pressure is based off of for a given load.

does that make more sense?

Load Index is only relevant when discussing ISO-Metric (ETRO) sizes which are not designated LT-Metric or P-Metric, and has nothing to do with LT-Metric tires, which are after all, the subject of this discussion.

HTH

Edit to add:

I would again refer anyone interested to review the excellent monograph published by Toyo Tires which covers a lot of tire general info, definitions of common tire terminology, and step-by-step procedures for determining RCTIP for any vehicle/tire combination - find it here: Guidelines for the Application of Load and Inflation Tables

 

[AnyMal]

Load Index is only relevant when discussing ISO-Metric (ETRO) sizes which are not designated LT-Metric or P-Metric, and has nothing to do with LT-Metric tires, which are after all, the subject of this discussion.

HTH

Hey gaijin. I’m talking about the first part of your comment really because it can be confusing.
The way you addressed it is also confusing.

Your load range does not determine your inflation pressure. Like you said it’s the size. That and your load.

When it comes to load index it does apply to p metric. But they use a different classification for Load range or rating such as SL and XL.

 

[AnyMal]

You are a very confused individual...

Bye

 

[Climbermac]

@gaijin
Reviewing your thread and responses; I gather that the RCTIP for the LT275/65 R18 Falken Wildpeak AT3W on my 2013 LX570 should be 45psi F/R... is that right?

THANKS!

 

[gaijin]

@gaijin
Reviewing your thread and responses; I gather that the RCTIP for the LT275/65 R18 Falken Wildpeak AT3W on my 2013 LX570 should be 45psi F/R... is that right?

THANKS!

The RCTIP for those LT275/65R18 tires on your LX570 is 40psi F/R.

HTH

 

[Climbermac]

@gaijin Thanks! That honestly sounds more like what I was thinking, hence the question!

Cheers!

 

[canyonrider]

@gaijin another one for you (thanks in advance): What's the RCTIP for the Nokian Rotiiva AT Plus in LT275/65/18 on my 2009 LC?

 

[gaijin]

@gaijin another one for you (thanks in advance): What's the RCTIP for the Nokian Rotiiva AT Plus in LT275/65/18 on my 2009 LC?

Glad to help!

The RCTIP for those LT275/65R18 123/120S tires on your LC200 is 45psi F/R.

HTH

 

[SportEater]

Sorry if this was already addressed.

Vehicle: '07 LX470
Tires: BF Goodrich All Terrain T/A KO2: LT285/65R18, 125/122R, Load Range E

Thank you.

 

[gaijin]

Sorry if this was already addressed.

Vehicle: '07 LX470
Tires: BF Goodrich All Terrain T/A KO2: LT285/65R18, 125/122R, Load Range E

Thank you.

I don't do LX470 recommendations, but all the info you need to find the RCTIP (Recommended Cold Tire Inflation Pressure) for yourself is contained in this excellent monograph on the subject published by Toyo Tires:

Guidelines for the Application of Load and Inflation Tables

HTH

 

[lx200inAR]

This thread is for 200 series, and afaik isn't a RCTIP calculator. If you wanted some help, you would at the very least need to include your TIP placard from your model truck (usually in the driver door jam).

 

[SportEater]

I don't do LX470 recommendations, but all the info you need to find the RCTIP (Recommended Cold Tire Inflation Pressure) for yourself is contained in this excellent monograph on the subject published by Toyo Tires:

Guidelines for the Application of Load and Inflation Tables

HTH

Thank you

 

[LCTX]

@gaijin, swapped tires out to Nitto G2 in 275/6 R18 116T XL.

Could you fill me in on RCTIP for them please? Tire shop has them at 36psi.

 

[gaijin]

@gaijin, swapped tires out to Nitto G2 in 275/6 R18 116T XL.

Could you fill me in on RCTIP for them please? Tire shop has them at 36psi.

If you mean the Nitto Terra Grappler G2 in ISO-Metric size 275/65R18 116T XL, and that they will be installed on an LC200 (not LX570), then:

The RCTIP for those 275/65R18 116T XL tires on your LC200 is 38psi F/R.

Your tire shop was close, but now you can be perfect.

HTH

 

[scottm]

'21 LC, online tire pressure calculator came up with 42psi. Discount tire wanted to set them at 35psi, not sure if they have their own calculator? @gaijin what do you come up with?

Pretty hard ride at 42psi, but feels nimble, and I like the higher hydroplaning speed for my highway driving in rain and snow. I tried them around town at 35 and they are significantly better riding without getting mushy, but wife still felt they were harsh.

Ran them around the bottom of Lake Michigan at 45psi in rain and rush-hour traffic, they felt great. TPMS showed them gaining just one or two psi at 75mph on dry pavement, I'm used to seeing 5psi increase on other tires, not sure why much less pressure increase?

What are the dangers of running 35psi or less on these tires if I go on vacation with the wife, long highway runs? I expect it will cost me handling and mileage, maybe outer tread wear? But would it harm the tires structurally to be flexing more at speed?
.

 

[gaijin]

'21 LC, online tire pressure calculator came up with 42psi. Discount tire wanted to set them at 35psi, not sure if they have their own calculator? @gaijin what do you come up with?

Pretty hard ride at 42psi, but feels nimble, and I like the higher hydroplaning speed for my highway driving in rain and snow. I tried them around town at 35 and they are significantly better riding without getting mushy, but wife still felt they were harsh.

Ran them around the bottom of Lake Michigan at 45psi in rain and rush-hour traffic, they felt great. TPMS showed them gaining just one or two psi at 75mph on dry pavement, I'm used to seeing 5psi increase on other tires, not sure why much less pressure increase?

What are the dangers of running 35psi or less on these tires if I go on vacation with the wife, long highway runs? I expect it will cost me handling and mileage, maybe outer tread wear? But would it harm the tires structurally to be flexing more at speed?
.

The Recommended Cold Tire Inflation Pressure (RCTIP) for those LT275/70R18 tires on your LC200 is 41psi F/R.

What are the dangers of running 35psi or less on these tires if I go on vacation with the wife, long highway runs? I expect it will cost me handling and mileage, maybe outer tread wear? But would it harm the tires structurally to be flexing more at speed?

By design specifications, no LT-Metric tire is recommended for use below 35psi on ANY vehicle. The best handle I can get on the rationale for this restriction is that because of the heavier construction of the LT tire, heat build-up due to tire flexing will be greater than can be normally dissipated by the tire - this would be worse at high speeds for long duration, like your "long highway runs." So... in your case, at 35psi or less, not only would the tire not have enough dynamic Load capacity to safely handle the weight of your LC200, it would increase the risk of catastrophic tire failure due to heat build-up.

My bottom line: Feel free to play around with whatever tire pressures float your boat, but keep them above the minimum recommended 41psi.

HTH