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21/11/2012 at 9:38am
Location: Holland
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The pressures they give in the list Michael gives link to, is what they call the reference-pressure, wich is not the maximum pressure of the tyre.
using refencepressure from that list for your tyre in my spreadsheet it even gives 34psi/2,4bar as advice. with all the reserves stil for little over- and mis-loading.
Saw some mistakes in the list, 2,4 bar is converted to 36 psi wich is 2,48 so mostly rounded to 2,5 bar.
Reference-pressure ( Further Pr) is the pressure the tyre-makers use to calculate the maximum load capacity up to the maximum speed of the tyre or if lower 160km /99m/h.
Difference between Pr and Pmax is used for higher speed and camber angle above 2 degrees( alighnment), for normal car tires and Extraload/XL/reinforced.
From C-load/6ply and up this Pr is given on the sidewall somewhat like this "maximum load xxxx kg AT yyy kPa " or LBS and PSI used.
This means that for those tires you are allowed to go higher then Pr. and this is used for more load at higher pressure, there are lists for that.
For Standard load and XL only the maximum pressure is given but Pr is standard 250kPa/2,5bar/36psi in Europe for standardload/normal car tyre. Smaller tires though use down to 2,1 bar and rule also is for 80% hight/width 2,4 bar/35 psi.
Though it is not supported by the tyre-maker, higher pressure gives extra load to carry, and in the past this was used for 10% extra load with 10% extra pressure for caravans. Gave much tyre damage because caravans are often overloaded at least at one wheel.
That is why I advice to use tyres with 10% to 25% reserve load to the Maximum permissable weigt of the caravan.
But if you use these extra's carefully, and take enaugh reserve in load, you can put higher pressure then Pr even for C-load (Pr50to55psi) and up and still is supported by the tyre-makers for lower speed.
In my spreadsheet I use 2,5 bar/36psi for all normal tires to make it easy, but if you use the pressures from the list for your tire the adviced pressure even gets lower.
Mind that American tires use different Pr and the system is not that flexible as in Europe. Pr normal car tyre/P-tire/standard load always 35psi, wich will give higher maximum load to a small tyre for wich in Europe 32psi is used. So if you find these strange differences between the same sises , when searching the market, it is probably because they gave American and European tyres/tires.
Post last edited on 21/11/2012 09:46:02
Post last edited on 21/11/2012 09:59:29
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signed in for tyre-pressure
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Topic: Tyre Pressure.
