Tire pressure

New truck owner here. "new to me" 2021 Tundra SR5, 4x4 with the offroad package.
I don't think the tires are stock. Bridgestone Dueler A/T LT275/70 R18 125/122S MS.
The driver door says 33psi front, 30psi back. At that low pressure, I feel like I'm driving on flats.
The truck came to me at 50psi, and the tire walls say they can hold up to 80psi.

My question is, how do I know what the right tire pressure should be?
I'm not towing anything yet.

 

I would go with what the door recommends. Or just 33 all around. 50 to 80 is super heavy duty territory you will get a worse ride, worse handling, and alot more wear on your suspension.

 

If your tires can take up to 80psi they are E rated tires. The door sticker is for stock tires. I keep mine all about about 35. Higher you go the longer they will last and harder the ride will be.

 

I run 35 all round.

 

Higher pressure, higher mpg
I keep mine around 45(sidewall max 51psi)

 

So I recently replaced my Michelins (50 psi max cold inflation) with E-range Toyo AT3's.

I had the same question and reached out to Toyo. Told them my info: Door sticker, truck, OEM tires, Toyo tires, etc.

They got back to me surprisingly quick and recommended that I run 42 front / 45 rear.

The 30/33 on your door sticker would be way underinflated for those tires.

You could contact Bridgestone and hopefully get the same great customer service I did from Toyo.

 

Wow, that calculator gave me the exact same answer that Toyo technical did. 42/45

 

Yeah, it seems to be a pretty accurate tool for calculating air pressures especially for guys changing tire size and load ratings. It's also a lot faster than doing a traditional chalk test...

 

This right here is gold. Thanks.

 

Appreciate this link!

Getting ready to install new tires today..


Looks like I'm just increasing pressure to 5psi

 

OPs door sticker is for P-metric (Passenger vehicle), standard load (SL) tires that come from the factory. Example P275/65 R18

when you replace with Light Truck (LT) tire e.g. LT276/65 R18 you must increase the pressures for the same load carrying capacity.

My Tundra has E load rated LT275/65 R18 Falken Wildpeak AT3W, running at 36-38 PSI. If my truck were loaded to capacity, I would have to inflate them to around 45 PSI to have the same load carrying capacity as the OE P275/65 R18 SL Wildpeaks inflated to 30/33 PSI per the door sticker.

Its counter intuitive.

 

Of course my screwing around with tire sizes doesn't correspond with the tire pressure calculator and I can't get a value.
If anyone has insight on the correct operating pressure of a 275/65/20 Toyo AT3 it'd be much appreciated. At 34psi they do look a little underinflated to me but i've always stuck to the sticker recommendation.

 

I'd say Toyo would have some insight.

https://www.toyotires.com/customer-care/contact-us/

I reached out to customer care and had an answer in pretty short order, straight from the horse's mouth.

 

thanks bro. i'll try my luck!