Tyre Pressures

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Sep 8, 2018 | 11:19 AM

Suffolkman

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From: Lindsey Suffolk England

Tyre Pressures

My F1 half ton pickup has a Mustang 2 front clip fitted. I have been using a tyre pressure of 33Lbs psi, but the ride is really hard...feeling every bump. The tyres are Coker Classics, Fronts 205/75/R15 and the rears 235/75/R15. I have been experimenting reducing the pressures. At 27 lb psi all round there is a big improvement in the ride. I just wondered how low in pressure I could go (especially at the front). What does anybody else run at ?.

Suffolkman

Sep 8, 2018 | 11:41 AM

raytasch

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From: W. Central FL.

Look at the chart here. I've found it valuable. https://static1.1.sqspcdn.com/static...+inflation.pdf

Sep 9, 2018 | 05:43 AM

GreatNorthWoods

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Joined: Apr 2002

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From: Littleton, New Hampshire

I ran 28 in front and 22 in the rear in my 48 F-3 with radials when I had it. It smoothed the ride considerably. I currently run 28 and 26 in my 53 Chevy Belair with MII front and radials.

Sep 9, 2018 | 05:47 AM

Suffolkman

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From: Lindsey Suffolk England

Hi, and thanks for your reply. I have set the fronts at 27 psi at the moment. I would like to try and reduce that a bit more...maybe down to 25. It certainly made a difference reducing the fronts from 33 to 27.

Sep 9, 2018 | 09:27 AM

Mr. Ed

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From: NJ

What does it say on the sidewall?

Later!
Mr. Ed

Sep 9, 2018 | 09:33 AM

Tedster9

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From: Waterloo, Iowa

The bias-plies don't say anything on the sidewall, like radials do. Ask Coker, they will probably say no less than 25 psi

Sep 10, 2018 | 11:17 AM

Suffolkman

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From: Lindsey Suffolk England

I talked to Coker when I got the truck. They recommended 35 psi all round. I did not ask what the minimum psi might be. But I don't think I would go under 25.

Suffolkman

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Sep 10, 2018 | 05:24 PM

Smitty49

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From: Huntsville, Al

I would be cautious of underinflatiing the tires. Underinflating will cause the sidewall of the tire to overheat with internal damage to the cords and construction of the tire at sustained use along with increase edge wear and lack of proper tread contact for road control. Any tire, whether radial or bias construction , require the proper pressure to ensure true tread contact to the road surface but also to dissipate the heat generate in the tire construction. This was a Heated debate when Ford and Firestone clashed during the Explorer and Radial Tire recall. Make sure the Tire size is equivalent to handling the vehicle load and that the suspension is adequate for the tire itself.