3macboys Posted June 1, 2023 Share Posted June 1, 2023 I've got a 1931 Pontiac 401 that I have just gotten back on the road. Car has wire wheels and 19 X 4.75/5.00 tire I believe. Just looking for the correct tire pressure that I should be running. Tires are of an unknown age and I'm leaning towards replacing them but while I shake it down I'm looking to at least run these ones at a proper pressure. Link to comment Share on other sites More sharing options...
Marty Roth Posted June 1, 2023 Share Posted June 1, 2023 Your existing aged tires likely have a maximum stated pressure of 32 psi For a rough estimate, I would assume that a safe amount might be 24 psi, believing you'll not be doing any high speed trials on old tires, but then, that is simply a guess on my part- Good luck 1 Link to comment Share on other sites More sharing options...
3macboys Posted June 1, 2023 Author Share Posted June 1, 2023 Thanks Marty - definitely no high speed runs. The car seems happy at 30 mph but I'm still getting used to it, I think the driver needs to be sorted more than the car. 1 Link to comment Share on other sites More sharing options...
Mark Shaw Posted June 2, 2023 Share Posted June 2, 2023 Maximum pressure and load should be embossed in the tire sidewall. 1 Link to comment Share on other sites More sharing options...
JFranklin Posted June 2, 2023 Share Posted June 2, 2023 Give them 34 PSI. You will have no troubles at that pressure. Too soft and you generate a lot of heat and flex. 2 1 Link to comment Share on other sites More sharing options...
chistech Posted June 2, 2023 Share Posted June 2, 2023 14 minutes ago, JFranklin said: Give them 34 PSI. You will have no troubles at that pressure. Too soft and you generate a lot of heat and flex. I run my own 32psi 19” ties at 34lbs and find a lot less wander and less mushy in corners. In general, the car drives much better. My tires are not new either and they are tube type so a couple pounds over shouldn’t be an issue. BUT, it just a suggestion and it’s your car to do what YOU want to do. 1 1 Link to comment Share on other sites More sharing options...
3macboys Posted June 15, 2023 Author Share Posted June 15, 2023 Thanks everyone - I put them up to 32 psi and took the car for a bit of a longer run than I have before. Quite happy at 40-45 mph. I'm sure that the car will run along a bit quicker but as I'm still getting used to it and it has sat for a number of years discretion is definitely the better part of valour. Link to comment Share on other sites More sharing options...
TTracing Posted June 15, 2023 Share Posted June 15, 2023 I put all new Coker WW 19 X 4.75/5.00 tires and tubes have them at 32 seems fine but 30 mph was about all it was happy with doing a timing chain now it was way loose that may make it a bit happier. Link to comment Share on other sites More sharing options...
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