Tire pressure recommended.

[LL75]

I know this is not for my rivian, but I just got a set of 275/60/20 Falken wildpeak AT3w for my silverado 1500. The stock all season tires recommended 35 psi front and back. Is it the same for Falken? This is my first set of AT tires and Google has been all over the places. Also noticed this is the same size of tires for many Rivian owners with 20” wheels who try to get the same diameter as the 21". BTW, I don't tow much for driving and live in Texas.

Thanks

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[SPITmadFIRE]

Recommended tire pressures on the door jamb are only for the factory OEM equipment installed on the vehicle. Changing wheel sizes, tire sizes, tire compound/load index ratings, etc. will all require you to figure out a new "best" tire pressure. Typically, the best way to figure out a good tire pressure is by using the chalk test. You can find lots of videos on YouTube how to do this.

 

[ndmiller]

Use the load the and index against tables for oem versus new tire. Welcome to the twentieth century.

 

[SPITmadFIRE]

Use the load the and index against tables for oem versus new tire. Welcome to the twentieth century.

Let's try to avoid bullying members who are curious enough to ask questions when they don't know the answers to them. Everyone starts somewhere!

 

[SPITmadFIRE]

OP, something else you may want to familiarize yourself with if you haven't already -- each tire has a load index and a speed rating. Respectively, they describe the maximum load (mass) and the maximum speed each tire can safely handle without failure.

Tire Rack does a great job explaining both load index and speed ratings here. I believe the 20" A/T Pirellis that Rivian ships are 275/65R20 116H which means they're rated for 2,756lbs per tire (at maximum pressure) and up to 130mph max speed. Because Rivian and Pirelli worked together on this tire specifically for R1T and R1S vehicles, it's a somewhat odd rating. Most other 275/65R20 options you'll find, like the Michelin Defender LTX Platinum, will have higher load indexes and lower max speeds (126S = 3,748lbs per tire, max speed of 112mph). Annoyingly, higher letter does not mean higher speed because the speed ratings were defined out of order at different points in history.

 

[LL75]

OP, something else you may want to familiarize yourself with if you haven't already -- each tire has a load index and a speed rating. Respectively, they describe the maximum load (mass) and the maximum speed each tire can safely handle without failure.

Tire Rack does a great job explaining both load index and speed ratings here. I believe the 20" A/T Pirellis that Rivian ships are 275/65R20 116H which means they're rated for 2,756lbs per tire (at maximum pressure) and up to 130mph max speed. Because Rivian and Pirelli worked together on this tire specifically for R1T and R1S vehicles, it's a somewhat odd rating. Most other 275/65R20 options you'll find, like the Michelin Defender LTX Platinum, will have higher load indexes and lower max speeds (126S = 3,748lbs per tire, max speed of 112mph). Annoyingly, higher letter does not mean higher speed because the speed ratings were defined out of order at different points in history.

Thank you.

 

[HaveBlue]

You'll want the same pressure as OEM unless you have the contact patch area and want to do math. 35psi is recommended based on the weight of the truck. IE 35psi * contact patch sqin * 4 tires must equal vehicle weight at least. If the tires you bought can't handle 35psi then their load rating is to low.

 

[FLTANK]

You may also find this site helpful:

https://tiresize.com/pressure-calculator/

 

[Glembi2]

Here’s a walkthrough of the chalk test:

https://www.intercotire.com/using_chalk_method_determining_psi

 

[ndmiller]

Let's try to avoid bullying members who are curious enough to ask questions when they don't know the answers to them. Everyone starts somewhere!

No intent to bully at all, I was passing on what I learned. Unfortunately my writing was imprecise, let me try again.

Use the load the and index against tables for oem versus new tire. It's the 20th century, the internet is way better than the chalk test.

Again learned this on ih8mud.com from the expert on tires on an LX570, but rushed my answer.

1. Look up the load data on your current OEM sticker and that will tell you the pressure and load used for your OEM tires for that load range and index.
2. Use an internet sear to find a load table for the new tire's load index (assuming it's not 116) and find the pressure the matches the load on the sticker on your Rivian.
3. Use that pressure Cold.
4. If you switch to a LT tire, it's another ball game and big rule is except for low speed, 35psi is the minimum as below that LT tires can spin on the wheel.

The chalk test does noting but measure deflection of the tire on a flat surface, not what load that pressure can handle. While the chalk test may show a pressure is ok or ideal, lower than proper load bearing pressure will generate excess heat that will eventually cause tires to fail eventually.

Wheeling/offroading/airing down fine, something else all together as it's not at 50+mph.

 

[BrentInCO]

Use the load the and index against tables for oem versus new tire. Welcome to the twentieth century.

We are almost 1/4 of the way through the 21st Century

 

[sdemeester]

Why can't you just fill to or slightly under the max pressure listed on the sidewall of the tire? On my R1T with 20 AT it is listed as 50 (cold), so that is about where I keep the tires. Also, when I had a loaner from Rivian I noted they had the tire pressure at 50 PSI as well. Thoughts?

 

[SPITmadFIRE]

Why can't you just fill to or slightly under the max pressure listed on the sidewall of the tire? On my R1T with 20 AT it is listed as 50 (cold), so that is about where I keep the tires. Also, when I had a loaner from Rivian I noted they had the tire pressure at 50 PSI as well. Thoughts?

OP is asking about different tires. Other tires have higher max pressures, and depending on the load index of the tire that max pressure may be way off. The OEM Pirellis have a max of 50psi because that's right around the ideal pressure for that specific tire's load index, and the load of the vehicle. The OEM Pirellis aren't meant to be installed on non-Rivian vehicles.

 

[davekarow]

You may also find this site helpful:

https://tiresize.com/pressure-calculator/

Nice link! Thx. Found this for my Continental Terrain Contact HT's:

https://tiresize.com/tires/Continental/TerrainContact-HT-275-50R22.htm

The 275/50R22 Continental TerrainContact H/T has a diameter of 32.8", a width of 11.2", mounts on a 22" rim and has 633 revolutions per mile. It weighs 41.6 lbs, has a max load of 2679 lbs, a maximum air pressure of 50 psi, a tread depth of 12/32" and should be used on a rim width of 7.5-9.5".

...as it turns out, my tire shop (Redwood General Tire Pros) inflated them to exactly the max of 50 psi.

 

[not_a_car_guy]

You may also find this site helpful:

https://tiresize.com/pressure-calculator/

Unfortunately I can't seem to choose the specs of either the 20" or 21" OEM tires in this tool.

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