K02 Tire Pressure?

[gaijin]

Gaijin,

Could I trouble you for a pressure recommendation?

LC200
BFG KO2 35x12.50R17 load rating E

Sorry for the delayed response - vacation.

The Recommended Cold Tire Inflation Pressure for the 35x12.50R17LT tires on your LC200 is 33psi F/R.

HTH

 

[gaijin]

I'm running the Yokohama GO15's in 275/70/18, one size up. They are not the E rated ones. What should I run on them? Currently dealer set them at 34

The only Yokohama Geolandar A/T G015 tires Yoko lists on their web site in that size are the LT275/70R18 125/122S Load Range E. If yours are not the Load Range E tires, do you have a link to the tires you have?

TIA

 

[NMNORSSE]

Two questions on tire pressure:

Is there an adjustment to account for altitude? For example, 42 psi might be right at sea level but what you live/wheel at 7,500 MSL?

Also, if we need 42 psi with a particular tire based on the actual weight of the built rig or manufacturer's weight/tire ratings, won't the tire be damaged if you "air down" and drive on the tires for any significant amount of time?

In general underpressurized tires heat up more than properly pressurized tires at speed and heat is an enemy of tire compounds which can lead to tread separation, shortened tire life and increase other risks of failure. In hot sand, will airing down and tooling around at 30+ mph just increase tread wear or will it also decrease sidewall integrity? Put another way if airing down isn't an increased risk while wheeling, will it nonetheless increase the risk of tire failure at speed on asphalt or just shorten the tire life?

 

[cava454]

Gaijin,

Do you know tires pressures for the the Comforser CF3000’s by any chance?

 

[gaijin]

Gaijin,

Do you know tires pressures for the the Comforser CF3000’s by any chance?

Sure. What tire size on what vehicle?

 

[Jdt30]

Gaijin,
I ran the charts myself. Do you mind double checking my math on Falken 285 65 r18’s? I come up with a load of 2224. Do you then round up to the higher 2425(to get a psi of45), or gnats a$$ it to the actual # between 40 and 45? Thanks

 

[gaijin]

Two questions on tire pressure:

Is there an adjustment to account for altitude? For example, 42 psi might be right at sea level but what you live/wheel at 7,500 MSL?

Also, if we need 42 psi with a particular tire based on the actual weight of the built rig or manufacturer's weight/tire ratings, won't the tire be damaged if you "air down" and drive on the tires for any significant amount of time?

In general underpressurized tires heat up more than properly pressurized tires at speed and heat is an enemy of tire compounds which can lead to tread separation, shortened tire life and increase other risks of failure. In hot sand, will airing down and tooling around at 30+ mph just increase tread wear or will it also decrease sidewall integrity? Put another way if airing down isn't an increased risk while wheeling, will it nonetheless increase the risk of tire failure at speed on asphalt or just shorten the tire life?

Simple answers are:

- The Recommended Cold Tire Inflation Pressure is assumed at ambient temperature and current Elevation. In other words, if you are at 7,500 feet Elevation and ambient temperature is 30 DegF, the Recommended Cold Tire Inflation Pressure is for 7,500 feet @ 30 DegF. Note, the pressure you are measuring with a tire pressure gauge is the difference between the air pressure inside the tire and the air pressure outside the tire. The effects of Elevation change on tire pressure are negligible - you can read a good summary here: https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=167 . Basically, tire pressures decrease when losing Elevation and increase when gaining Elevation (about 4-5psi per 10,000 feet).

- Airing down is for off-road, slow speed, temporary use only. Off-road "wheeling" while aired down does put additional stress on all parts of a tire and will shorten tire life to a greater or lesser extent based on the severity of the wheeling. It is always good practice to air down only when needed, not to air down to below safe pressures ( based on a whole slew of variables), and to air up as soon as practicable.

HTH

 

[gaijin]

Gaijin,
I ran the charts myself. Do you mind double checking my math on Falken 285 65 r18’s? I come up with a load of 2224. Do you then round up to the higher 2425(to get a psi of45), or gnats a$$ it to the actual # between 40 and 45? Thanks

I assume you are talking about the Falken WILDPEAK A/T3W LT285/65R18 E 125/122S on a 200 Series Land Cruiser.

The required Load Limit for LT-Metric tires on the LC200 is 2,286 pounds.

From the Load Limit / Pressure charts, we find the Load Limit @40psi is 2,235 pounds and @45psi it is 2,425 pounds.

Although the charts are not always perfectly linear, it is usually not far wrong to interpolate data for a 5psi range. In this case, there is a 38psi increment for each psi between 40psi and 45psi.

Since we need at least 2,286 pounds, we need to add an additional 2psi above 40psi (2,235 + (2 x 38) = 2,311) to exceed that minimum (rounding to the nearesrt whole psi above minimum).

So, the Recommended Cold Tire Inflation Pressure for the Falken WILDPEAK A/T3W LT285/65R18 E 125/122S on a 200 Series Land Cruiser is 42psi Front/Rear.

HTH

P.S. Not sure where you "came up with a load of 2224"

 

[Jdt30]

Since we need at least 2,286 pounds, we need to add an additional 2psi above 40psi (2,235 + (2 x 38) = 2,311) to exceed that minimum (rounding to the nearesrt whole psi above minimum).

Thanks, and I’ll blame the 2224 on an Oklahoma public education.

 

[cava454]

Sure. What tire size on what vehicle?

315/75/16

Thanks mate.

 

[gaijin]

315/75/16

Thanks mate.

Sorry, mate. That won't fit on a 200 series. I can't help you.

 

[cava454]

Sorry, mate. That won't fit on a 200 series. I can't help you.

Yeah would of helped if I read the topic location. It’s for an 80series.

 

[InkMing]

@gaijin Not sure I saw it in the thread or not, but correct pressure for 285/70 R17 285/70R17?

E-Rated. KO2.

Appreciate it as always sir.

 

[gaijin]

@gaijin Not sure I saw it in the thread or not, but correct pressure for 285/70 R17 285/70R17?

E-Rated. KO2.

Appreciate it as always sir.

It's in my sig ... if you ever forget

The Recommended Cold Tire Inflation Pressure for the BFG All-Terrain T/A KO2 LT285/70R17/E 121/118R tires Part# 99728 on your 2014 Land Cruiser is 40psi F/R.

HTH

 

[gaijin]

@gaijin Not sure I saw it in the thread or not, but correct pressure for 285/70 R17 285/70R17?

E-Rated. KO2.

Appreciate it as always sir.

If you are interested in the long (and painful) history of that recommendation, read this thread: Tire Pressure for Rock Warriors with LT285/70/17, Load range Es?

HTH

 

[luke27617]

Can someone tell me what is the proper tire pressure for K02 285/55r20 D? Thx

 

[gaijin]

Can someone tell me what is the proper tire pressure for K02 285/55r20 D? Thx

If you mean the LT285/55R20/D 117/114T tires, and if you are using these on an LC200 and NOT an LX570, then...

The Recommended Cold Tire Inflation Pressure (RCTIP) for the LT285/55R20/D 117/114T tires on your LC200 is 48psi F/R.

HTH

 

[luke27617]

If you mean the LT285/55R20/D 117/114T tires, and if you are using these on an LC200 and NOT an LX570, then...

The Recommended Cold Tire Inflation Pressure (RCTIP) for the LT285/55R20/D 117/114T tires on your LC200 is 48psi F/R.

HTH

Yes it is LC200 and exactly the tire you have mentioned. Thank you!!!

 

[Giantlexus]

@gaijin Wondering if you would assist with tire pressure for 2005 LX470 - Bridgestone K02 LT275/65R18 123/120R Load Range E. Thank you

 

[gaijin]

@gaijin Wondering if you would assist with tire pressure for 2005 LX470 - Bridgestone K02 LT275/65R18 123/120R Load Range E. Thank you

Sorry, I only do the calcs for LC200/LX570; but all the info you need to do the calcs yourself can be found in an excellent monograph on the subject published by Toyo Tires - find it here: Guidelines for the Application of Load and Inflation Tables

HTH