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Tires/Tyre Pressure

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Question
QUESTION: I'm using Hankook ventus H437 205/50/R16. I had ask a few tyre shop for the correct tyre pressure for tyre I have mention but they keep on giving me different unit pressure... I try to pump 230kpa but the tyre sidewall like not enough air pressure..

ANSWER: Ahmad,

On every vehicle sold in the US, there is a sticker - the vehicle tire placard - that lists the original tire size and the proper pressure for that size.  The placard is usually located on the driver's doorframe, but sometimes is can be found in the glove box, on the fuel filler door, or in the trunk.  

Also, the owners manual sometimes will have the size and pressure listed.

If the tire size being used is not listed on the vehicle tire placard, then the pressure must be recalculated.  The calculation isn't difficult, but requires the use of tire load tables, which can be difficult to find.  Fortunately, I have those tables and am willing to do the calculation if you'll supply me with 3 things:  What the vehicle tire placard says for size and pressure and the new tire size.

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QUESTION: My new tyre size 205/50/R16. Hankook ventus H437. Base on the size given, what's the correct (psi) I should use.

Answer
Ahmad,

The size alone doesn't tell you enough information about inflation pressure.  What is also needed is how much the vehicle weighs on each corner, and what spring rate did the vehicle manufacturer decide to use to set up his suspension - and that information is boiled down for simplicity on the vehicle tire placard as the size of tire and the inflation pressure specification.  That pressure specification applies to ALL tires of that size, and without that one can not tell you what the proper pressure is supposed to be as that size goes on many vehicles, and the pressure specifcation varies for each application.

HOWEVER, if you have the year, make, and model of your car, I have a summary published by a group called Tire Guides for every vehicle produced in the US.

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Barry Smith

Expertise

I have over 30 years experience in the design, manufacturing, and testing of tires. I have served as the technical advisor to the "800" number. I have authored or co-authored many publications - usually without credit. I can answer almost any technical question, but please don`t ask me to compare brands. I probably have prejudices because of my work experience.

Experience

Member SAE (Society of Automotive Engineers) Member Tire Society (Tire Technical Organization) SCCA Regional Competiton License holder Authored many training manuals on tires, their care and use.

Organizations
SAE (Society of Automotive Engineers) SCCA (Sports Car Club of America) Tire Society

Publications
You may want to visit my web site: http://www.barrystiretech.com/index.html

Education/Credentials
I am a graduate of the University of Dayton, Dayton, OH - BME, 1971 I attended graduate school at the University of Akron - but did not complete my PhD - something I regret.

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