Re[2]: {Chrysler 300} Tire Pressures

I have four sets of DB radials. Two Chrysler station wagons and two Letter Cars. As per DB direction and also my tire shop, Performance Plus Tires in Long Beach, CA they recommend 40 PSI which works well for me. I've tried lower settings but the cars feel mushy. When I ran L78x15 bias I used 35 PSI and once again lower the cars felt mushy. Our '57 300C is still on bias tires but waiting to upgrade.

John Lazenby

On Friday, July 26, 2024 at 09:40:56 AM PDT, 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

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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