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 Topic: tyre pressure
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31/5/2015 at 9:08pm
Location: Holland
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Inside tyre temp is about 45degrC/112degr F when driving about 60m/h on normal day temperature.
So if you read that , the tyres must be save is my carefull conclusion.
When severe braking or sunshine on tire the inside tire temp can rise to 100degrC/212degr F , so a valve importer wrote me. At that moment the pressure will rise so lesser deflection , so lesser heat production.
So dont be alarmed if you read that temp on your TMPS.
If you know then that you have been serverely braking, thats the cource.
But my conclusion is that if you would realy drive with given maximum load on a tyre AT pressure tyre maker gives, and your speed is over 99m/160 km/h , wich is reference speed they calculate it all for, you will damage your tires , and there is no , or yust little reserve .
The reserve is created by calculating it for 99m/h and only driving 75m/h wich gives , as I have found out, 4 LI steps more maxload = 12% more maxload.
But again I calculate a highest pressure at wich comfort and gripp is still acceptable so leaves as much possible reserve for things like.
Pressure loss in time.
Misreadings of pressure ( by your selfes of inacurate device)
Misyudging of real weight.
Unequall load R/L.
etc
etc
In time also misyudging by tyre- and car-makers has happened.
One is the old 10% rule. For older caravans normal car tyres where placed with system 10% extra pressure gives 10% extra maximum load if you only drive 100km/62m/h maximum. Many blowing tyres because real load went even over this new maxload or speed higher.
Also in America ST-tires wich are given maxload for 65m/104km/h, wich is about 18% higher then a Q speedrate tyre ( 99m/h).
Also many blowing tyres because calculate to the edges.
That these 2 systems are not in line with each other must be saying something, to my conclusion that at least one of the systems is to exagerated.
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signed in for tyre-pressure
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