Comment: Using the <span class="highlight">4psi</span> Tyre Inflation Rule

Submitted: Wednesday, Jan 30, 2013 at 12:02

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Using the 4psi Tyre Inflation Rule

I am not advocating the use of the 4psi rule, but a quick internet search will indicate that many people are using this rule. This blog is meant to increase the understanding of the effect of

BobT3218

Rob D,
A excellent write up! Perhaps you should issue an ammended 4psi rule including the proviso that the ambient temperatures when measuring cold and again when hot should be the same or at least within certain limits.

However, I'm sceptical about the 4psi rule anyway. I can't find any reference to it on any formal tyre company site or research document. Until I do, I can't be sure that this isn't just self perpetuating folk lore regardless of it's seeming practicality. Any comments?

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Reply By: Member - Rob D (NSW) - Wednesday, Mar 04, 2015 at 01:11

Wednesday, Mar 04, 2015 at 01:11

Hi Bob,

Thank you for the feedback. At the top of my blog I stated "I am not advocating the use of the 4psi rule", but I know many people are using it and using it incorrectly. I have found it on numerous websites.

As far as I can gather from my internet research, the 4psi rule was stated by a Pirelli tyre engineer on some race track in the US. Given that some of our outback trips have very large temperature changes from morning to midday I really meant for readers to have a better understanding the effect that temperature has on tyre pressures.

See my Blog "Are You Operating Your Tyres Beyond Their Design Limits" BlogID: 2723 for information from Tyre Manufacturers and the US Tire and Rim Associaton.

http://www.exploroz.com/Members/216531.875/2/2011/Are_You_Operating_Your_Tyres_Beyond_Their_Design_Limits_.aspx