Good morning,
I have bridgestone DUELER A/T 001 3PMSF M+S 255/70 R16 111 S for my explorer V8
On my car, i have this inscription (see the file) : i think the pression is kPa/30..is it true ?
And in France the pressure is in Bar. How can i change kPa in bar ? Is it 3 bars ?
Are my tirs can endure 3 bars ?
At this time, i have 2 bars but i think it's not enough.
Thanks for answers
Thomas
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Put it into my made motorhome tirepressure calculator and gave front 21 psi and rear 25 psi.
In this I add 5% to the front gawr of 2850lbs, and 18% to the rear gawr of 3000 lbs.
Then calculates pressure with extra safe formula( so gives higher pressure then the official european formula that is since 2006 also used in America for P-tires.
So if your tires are onroad tires with normal profile blocks, this is a safe pressure upto 99mh.
In the Ford/Firestone- affaire ofroadlooking tires where used with profileblocks that covered part of the sidewall, wich gave more heatproduction at the same deflection( so same pressure for the load on tire) .
To my conclusions, this was the real cource of the blowing rear tires that lead to rollover-accidents.
Advice pressures in this time for the Explorer was 26 psi , and later highened up to 30 psi.
SO IF YOU HAVE THAT OFFROADLOOKING TIRES STILL, MY ADVICE IS TO LOW.
For that I lowered the loadindex 111 by 8 steps to 103 wich is 20% lower and this gives advice of front 29 psi and rear 32 psi.
Then you have a deflection that gives lesser heatproduction, but comfort and gripp is less.
The 18% adding to gawr rear I do for motorhomes, to cover overloading and unequal loading R/L , and this is also not bad for your car.
See on picture its from 1998 so probably the plate has been chanched in a callbach action. Original plate then gave 26 psi.