fracturedranga wrote:Look up the 4psi rule. Its a pretty reliable way to work out your pressures
Excellent statement, but it wont work with nitrogen in the tyres lol.
Nitrogen's biggest advantage is it does not expand with heat, so on haul trucks makes a difference but even then no site I have worked on actually uses it.
Also, how do you get all the air out of your tyre? even deflated it still has one bar in it and another two bar is added as nitrogen, leaving 33% air in there.
If it is only the oxy that is escaping then topping up with air will eventually leave almost no oxy in the tyre as it has all escaped over time trapping the other gasses in the tyre. In my opinion, not worth the expense.
Anyway lets get back on topic,
When I got my hilux new in 2012 it had 40 psi and I reduced it to the 29 psi in the book.
Every time I got it back from a service it was back to 40, I gave up letting it down as it did mainly town driving.
Those original tyres did 109k before I got sick of waiting for them to wear out so I could get a set of KO2s which were getting hard to get in those days. The old tyres just passed an inspection for an ATM upgrade on my trailer.
Don't know how long they would have lasted with 29 psi, but I have never had a set of tyres last more than 80k before on anything.
AND that was with air in them.