RE: {Chrysler 300} Tire Pressures

If you want to be exact, there are load vs pressure tables for different size tyres in tyre standards manuals, but you have to pay for those manuals or maybe view them in a library.

The link briefly explains https://www.infrastructure.gov.au/sites/default/files/migrated/vehicles/vehicle_regulation/bulletin/files/Street_COP_Rev2_App_2.pdf

Otherwise, the calculation below may be ok as a general rule.

I have used 36 psi for forty years for older cars with radials and it has served me well but that is just my experience with my cars and how the tyres have worn.

Henry

From: 'James Douglas' via Chrysler 300 Club International [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx]
Sent: Saturday, 27 July 2024 2:41 AM
To: Nick Taylor
Cc: Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx)
Subject: RE: {Chrysler 300} Tire Pressures

I have run tires all over the place in the last 30 years on my classic cars. I would love to come up with a more science based way to figure it out.

I did run across this but have no way of knowing if it reflects reality or not.

https://www.engineersedge.com/calculators/tire_pressure_vs_load_16251.htm

According to this a 4000 pound 300K should be running about 28.9 PSI for a tire with a 1764 max load rating at 51 PSI.

James

From: Nick Taylor <nicksgaragesd@xxxxxxxxx>
Sent: Friday, July 26, 2024 09:27
To: James Douglas <jdd@xxxxxxxxxx>
Cc: Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx) <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} Tire Pressures

I've been running radials on old mopars since I first switched over on my 1964 300 back in the late 70s. I pretty much run them at 32 psi on everything. My 300F has American Classics and Coker Classics before that and it seems to be the best pressure. Certainly couldn't run the 22 psi that the original bias tires were run at.

Nick

On Fri, Jul 26, 2024 at 9:17 AM 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

I am sure this will open up a pandoras box…

I would like to know how people are dealing with the subject of tire pressures with modern radials on those older Chryslers?

The Service Manual pressures for bias ply are obviously way too low. So, how are people arriving at a “proper” tire pressure for optimum use and tread life?

It would be nice if the tire companies put on their websites the load-pressure graphs they no doubt have. But of course, they will not.

If one runs at the max pressure on the tires and the car is substantially less in weight, then the tires will not perform as well or wear as well as the should. Same if they are under inflated.

So, I would like to hear how people are dealing with this issue.

Thanks, James
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