Wednesday, Sep 13, 2017 at 23:14
Sorry but that article can be little more than pseudo science.
As for adding 3 psi for light truck tyre utterly meaningless
load V pressure is not discussed neither is tyre type ...... Light truck is a very general term.
some types of light truck tyre run lower pressures at load than other types .... fir example there are quite substantial differences between the flotation family of tyres and the common metric light truck tyre ...... tyre profile also changes load V pressure behaviour. ... and every other behaviour.
Some light truck tyres have nearly identical load V pressure profiles and pasenger tyre of the same type and size
So what if you are running a "light truck tyre" close to it's maximum load capacity at 65psi
What if you where running a tyre very low in its load range with pressures in the mid twenties to the low 30's.
note that the graph has no specific temperature on the temperature axis ... so is not of any use at all, not even as a guide. ...it is little more than popular pseudo science.
Now the statement that if a tyre has reached an internal air temperature of 100C damage has occured ....... no doubt ...... but I doubt that the damage is from the internal air temperature ... the damage is from the internal friction in the tyre structure and external influences..... the same friction and external influences that caused the heat.
in a worst case, very low pressures can cause permanent damage to tyres in a matter of meters log before the air temperature in the tyre can change.
internal tyre air temperature is a lagging result ....... the damage is done before the air temperature changes.
Note that speed is not discussed
as for learning that temperatures are at maximum after 30 minutes .... at what ambient temperature, under what load conditions.
it may be that it takes 30 minutes for the temperature to transfer to the air.
Besides even if the graph is anything other than inspired fiction ..... the graph indicates that at low pressures, the tyre may be damaged in under 10 minutes
so ya going to set an alarm at 55C .... how is that going to go in ambient temperatures of 45C and road temperatures much higher than that.?
Note that in discussing tyre pressures, nearly always we reduce the variables by speaking of cold inflation pressure .... because temperature and it's effects is such an unreliable variable
go set your temperature alarm to anything you like ...... but remember is it a lagging factor ..... it shows after the fact.
cheers
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