Tire Pressure recommendation (10 Viewers)

[2014 LEX 570 GA]

Appreciate this thread and any help you can provide:

Stock 2014 LX570

305/55 R20 Toyo Open Country AT2 Load Range E (121/118S) on stock wheels

 

[gaijin]

Appreciate this thread and any help you can provide:

Stock 2014 LX570

305/55 R20 Toyo Open Country AT2 Load Range E (121/118S) on stock wheels

Since you say these tires are Load Range E, then I assume they are an LT-Metric tire. If so:

The RCTIP for LT305/55R20 tires on your LX570 is 36psi F/R.

HTH

 

[Croozur]

gaijin…
My local Discount Tire in Colorado insists on bumping up RCTIP by 3-5psi due to our higher elevation (around 7000’MSL) and I always insist that they don’t since I disagree with their reasoning.

It just seems like nonsense since I’m not driving from Colorado to sea level on a daily basis so I always have them use an unadjusted RCTIP and tell the tech that the only factor of concern influencing my tire pressure is temperature.

Am I wrong? What am I missing here?

Incidentally… I currently run my LT285/75/17 121/118S Toyo Open Country ATIIIs at 37psi.
Discount Tire wants them at 42psi.

Thanks.

 

[gaijin]

gaijin…
My local Discount Tire in Colorado insists on bumping up RCTIP by 3-5psi due to our higher elevation (around 7000’MSL) and I always insist that they don’t since I disagree with their reasoning.

It just seems like nonsense since I’m not driving from Colorado to sea level on a daily basis so I always have them use an unadjusted RCTIP and tell the tech that the only factor of concern influencing my tire pressure is temperature.

Am I wrong? What am I missing here?

Incidentally… I currently run my LT285/75/17 121/118S Toyo Open Country ATIIIs at 37psi.
Discount Tire wants them at 42psi.

Thanks.

Are you asking about a LC200 or an LX570?

 

[Croozur]

Sorry… 2018 LC200.

 

[gaijin]

gaijin…
My local Discount Tire in Colorado insists on bumping up RCTIP by 3-5psi due to our higher elevation (around 7000’MSL) and I always insist that they don’t since I disagree with their reasoning.

It just seems like nonsense since I’m not driving from Colorado to sea level on a daily basis so I always have them use an unadjusted RCTIP and tell the tech that the only factor of concern influencing my tire pressure is temperature.

Am I wrong? What am I missing here?

Incidentally… I currently run my LT285/75/17 121/118S Toyo Open Country ATIIIs at 37psi.
Discount Tire wants them at 42psi.

Thanks.

Sorry… 2018 LC200.

OK, thanks.

For starters, RCTIP is set when tires are at ambient temperature (and pressure) - no "fudge factor" for being at high (or low, for that matter) elevation. Toyota defines "cold" tire status pretty well in this document:

Incidentally... the RCTIP for those LT285/75/17 121/118S Toyo Open Country ATIIIs on your LC200 is, indeed, 37psi F/R.

So, yes, you are correct on both points. Discount Tire is incorrect with their recommendation to "bump up" your cold tire pressure to 42psi.

HTH

 

[Croozur]

That helps tremendously! Thank you for taking the time to help me out with this.

Cheers!

 

[TeCKis300]

gaijin…
My local Discount Tire in Colorado insists on bumping up RCTIP by 3-5psi due to our higher elevation (around 7000’MSL) and I always insist that they don’t since I disagree with their reasoning.

It just seems like nonsense since I’m not driving from Colorado to sea level on a daily basis so I always have them use an unadjusted RCTIP and tell the tech that the only factor of concern influencing my tire pressure is temperature.

Am I wrong? What am I missing here?

Incidentally… I currently run my LT285/75/17 121/118S Toyo Open Country ATIIIs at 37psi.
Discount Tire wants them at 42psi.

Thanks.

Discount Tires is compensating for tire gauge measurement impacts as a result of altitude. Colorado is not typical so this is local knowledge that could be useful. If you were to travel only at elevation, then perhaps there's no need to account for the delta. As you travel to lower elevations regularly, it's perhaps not a bad idea to account for the altitude difference.

Tire Rack has a great article on this:

https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=167

 

[Croozur]

Discount Tires is compensating for tire gauge measurement impacts as a result of altitude. Colorado is not typical so this is local knowledge that could be useful. If you were to travel only at elevation, then perhaps there's no need to account for the delta. As you travel to lower elevations regularly, it's perhaps not a bad idea to account for the altitude difference.

Tire Rack has a great article on this:

https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=167

View attachment 2959664

The key word is CHANGES in altitude. I agree with the need to adjust in that case but my attitude might vary by 2000 feet on daily drives and when on the trails, an increase of 5000’-6000’ but that world require reduced pressure.

I don’t think the average daily driver needs its tire pressure increased due to being located at a higher altitude.

 

[TeCKis300]

The key word is CHANGES in altitude. I agree with the need to adjust in that case but my attitude might vary by 2000 feet on daily drives and when on the trails, an increase of 5000’-6000’ but that world require reduced pressure.

I don’t think the average daily driver needs its tire pressure increased due to being located at a higher altitude.

Yup, that would be fine and would only be a 1PSI difference for your use case, which is in the noise. As Discount Tire can't guarantee that all their customers wouldn't venture to lower elevations, it's probably a risk mitigation they've adopted.

 

[Croozur]

Yup, that would be fine and would only be a 1PSI difference for your use case, which is in the noise. As Discount Tire can't guarantee that all their customers wouldn't venture to lower elevations, it's probably a risk mitigation they've adopted.

You’re right about risk and liability. I didn’t account for lawyers running the world! That’s probably why they do it.

 

[coleAK]

Let us know how the C load KO2 is please!

Got impatient and Put them on. Ride is a lot softer then the E load KO2s I had on prior, but not overly soft. And not as soft as my p metric winter Hakkas. Seems like a good choice so far.

 

[AnyMal]

Got impatient and Put them on. Ride is a lot softer then the E load KO2s I had on prior, but not overly soft. And not as soft as my p metric winter Hakkas. Seems like a good choice so far.

View attachment 2987465

Nice, I really wish i could take that for a spin!

Dig the Alphas too. 35 is IMO the best offset for a plus size tire.
Im always playing with setup choices and right now, i kind of want to get into a 18" wheel. Having hard time finding not costly custom wheels in that size and a good offset. But there is always trd and spacers for 18s. A 19" wheel would be cool too.

 

[coleAK]

Nice, I really wish i could take that for a spin!

Dig the Alphas too. 35 is IMO the best offset for a plus size tire.
Im always playing with setup choices and right now, i kind of want to get into a 18" wheel. Having hard time finding not costly custom wheels in that size and a good offset. But there is always trd and spacers for 18s. A 19" wheel would be cool too.

I’m happy with the set up but I still wish I could have found some reasonable priced RWs with +50. Looking at it I have this fear Even with +35 I think my paint is going to get hammered in the front quarter panel posterior of the the front wheel well when I do long trips up northern AK.

 

[grinchy]

I’m happy with the set up but I still wish I could have found some reasonable priced RWs with +50. Looking at it I have this fear Even with +35 I think my paint is going to get hammered in the front quarter panel posterior of the the front wheel well when I do long trips up northern AK.

Amazon product ASIN B07JC8ZMTG
?

I don't see much spray on my truck with 10.5 (270ish) and no front tire mud flaps at 35mm offset. But I have considered something like the above fit wide as a prophylactic measure.

 

[AnyMal]

I’m happy with the set up but I still wish I could have found some reasonable priced RWs with +50. Looking at it I have this fear Even with +35 I think my paint is going to get hammered in the front quarter panel posterior of the the front wheel well when I do long trips up northern AK.

We may have different panels there, but a +35 would put me right inside the fenders where my 25s would poke.
I do have a stance thread somewhere last year on this.
I would be plenty pleased with what you ended up with though.
There will always be some splash but its either a PP film wrap for thousands, or YOLO.
These days i prefer to just enjoy the car. Im tired of stressing over details.

 

[coleAK]

Amazon product ASIN B07JC8ZMTG
?

I don't see much spray on my truck with 10.5 (270ish) and no front tire mud flaps at 35mm offset. But I have considered something like the above fit wide as a prophylactic measure.

Thanks for the heads up. Just ordered a set, on sale for $17. I can put on when we head up the Dalton late summer or just leave them on. That trip we do ~1000 miles of gravel/dirt/mud in 3-4 days and the road is fairly curvy so even small turning the wheel throws a ton of mud. Last fall it was the muddiest I’ve ever seen it and had 3-4” of mud on my running boards at all times.

 

[coleAK]

We may have different panels there, but a +35 would put me right inside the fenders where my 25s would poke.
I do have a stance thread somewhere last year on this.
I would be plenty pleased with what you ended up with though.
There will always be some splash but its either a PP film wrap for thousands, or YOLO.
These days i prefer to just enjoy the car. Im tired of stressing over details.

I hear you, I only worry about paint in the context of preventing rust.

 

[Bryanmc]

I searched and saw recommendations for 41psi for an LC, but not for an LX. Didn’t know if there would be a difference.

KO2 - LT275 /70 R18
2010 LX570

Costco told me 50psi.

 

[gaijin]

I searched and saw recommendations for 41psi for an LC, but not for an LX. Didn’t know if there would be a difference.

KO2 - LT275 /70 R18
2010 LX570

Costco told me 50psi.

The RCTIP for those LT275/70R18 tires on your LX570 is 36psi F/R.

HTH