Tire pressure on 2024 Silverado?

[football]

Hey guys. I have a 2024 Silverado trail boss. It came with factory LT265/60/20 load range C tires with a door jamb pressure of 41 PSI with max inflation of 60 PSI on the tire.

I just bought some Cooper 275/60/20 Discovers all terrains that are SL rated with a max inflation of 44 PSI on the tire. Walmart refused to install the new tires becuase they are not load range C (annoying) even though the new tires have a higher weight capacity than the load range C tires that came on the truck.

What is the factory PSI for the regular 2024 Silverado trucks that came with regular tires? I’m pretty sure it’s not 41 psi and closer to 35/36 psi?

 

[Bob in Utah]

Chalk test em

 

[barkingspider]

I agree it’s closer to 35/36 psi. Try it and see if it rides good for you. I didn’t know the Trail Boss trim came w 20” wheels. 17s or 18s would be better for driving on “trails”.

 

[CKN]

Hey guys. I have a 2024 Silverado trail boss. It came with factory LT265/60/20 load range C tires with a door jamb pressure of 41 PSI with max inflation of 60 PSI on the tire.

I just bought some Cooper 275/60/20 Discovers all terrains that are SL rated with a max inflation of 44 PSI on the tire. Walmart refused to install the new tires becuase they are not load range C (annoying) even though the new tires have a higher weight capacity than the load range C tires that came on the truck.

What is the factory PSI for the regular 2024 Silverado trucks that came with regular tires? I’m pretty sure it’s not 41 psi and closer to 35/36 psi?

Deleted

 

[BobsArmory]

On my 2023, if i get to 35 psi my TPMS system will light off. 41 is where I have mine. Open up the drivers door and look at the sticker. That will tell you where it should be.

 

[AZjeff]

Read his post Bob. Different tires.


Search is your friend @football. This is an RST truck.

 

[2strokeNorthstar]

I agree it’s closer to 35/36 psi. Try it and see if it rides good for you. I didn’t know the Trail Boss trim came w 20” wheels. 17s or 18s would be better for driving on “trails”.

It's so stupid that the off road packages are worse for off road. I guess they know their market. Ford Tremor and the new Defender come to mind too. Larger wheels with smaller tires is so much worse for off road, even just fire roads.

 

[AZjeff]

It's so stupid that the off road packages are worse for off road. I guess they know their market. Ford Tremor and the new Defender come to mind too. Larger wheels with smaller tires is so much worse for off road, even just fire roads.

Not stupid, 93.57% of offroad packaged trucks never touch a dirt road. Lifestyle image like most jeeps.

 

[NiwradND]

I would run around 40 psi

 

[2strokeNorthstar]

Not stupid, 93.57% of offroad packaged trucks never touch a dirt road. Lifestyle image like most jeeps.

Agreed, It's just irritating they sell it as an offroad upgrade. If it was some package the fakers could enjoy like Metal Mullisha edition or something, I would be fine with it. Like the F150 Harley edition that couldn't fit a Harley in the bed.
As I get older, I might actually prefer something that looked like a cool off roader, that doesn't need the maintenance or fuel. Like the old Nissan Desert Runner. No need to lie though.

 

[meep]

35-38psi is about where I’d expect to run SL tires in that size on a 5000lb truck. That’s a very common size. Pretty sure my ‘18 F150 had that as the stock size. I’ll bet you are happy with the coopers. Please let us know how the ride and handling works out with the new SL tires.

 

[football]

I’ll try 36 PSI and see how they ride. Thanks everyone.

 

[CapriRacer]

Here's how to do this:
1) Match the load carrying capacity.
2) If the pressure needed for the new tire size is less than the pressure for the original tire size, it would be better to use that pressure.

So let's do it:

First thing needed is the load table: https://www.tirepressure.org/

LT265/60 R 20 at 41 psi = 2035#.. you have to interpolate.

P275/60R20 at ??

First, it's a Passenger car tire and when those are used in a Light Truck application, they have to be derated by 10%.

So at 26 psi, P275/60R20 = 2260 less 10% = 2040#.

Now since that is less than 41 psi, use 41 psi.

Why the same pressure? Because the spring rate and the damping coefficient of a tire is closely tied to the inflation pressure, so that is closest to what the vehicle design engineers used when they designed the truck.

Side note: I guess I'm going to have to publish a webpage on the subject. Somewhere back in time I was part of a committee of tire engineers from several tire manufacturers who developed that procedure, so I am going to have to find out where we published it. Oh boy, I just love digging to find stuff like that!! /sarcasm

 

[football]

Now since that is less than 41 psi, use 41 psi.

Why the same pressure? Because the spring rate and the damping coefficient of a tire is closely tied to the inflation pressure, so that is closest to what the vehicle design engineers used when they designed the truck.

The door sticker posted above shows 32 PSI front and 35 rear for a regular Silverado 1500 with standard p metric tires. So apparently GM thinks 32/35 is correct and not 41 (when not using LT load range C tires.

 

[AZjeff]

The door sticker posted above shows 32 PSI front and 35 rear for a regular Silverado 1500 with standard p metric tires. So apparently GM thinks 32/35 is correct and not 41 (when not using LT load range C tires.

Different suspension calibration between Trail Boss and RST models?

 

[CapriRacer]

The door sticker posted above shows 32 PSI front and 35 rear for a regular Silverado 1500 with standard p metric tires. So apparently GM thinks 32/35 is correct and not 41 (when not using LT load range C tires.

Different suspension calibration between Trail Boss and RST models?

My thoughts exactly. Why would GM have the same pressure front/rear for LT tires and different for P metrics? I think there is something else going on.