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I compared the 235/80R16 in goodyear list .
Your tire is realy calculated in maxload for 87mph belonging to N speedrated.
The ST of Goodyear has 3960 lbs maxload is loadindex 128 so 3 li steps higher , so 3x10 kmph lower speed is 110 kmph 65mph is 104kmph.
The unisteel G614 in that same document is LT , calculated for 160 kmph/99mph. so would mean 2 LI steps lower , has 3415 lbs at 95 psi.
This is loadindex 123, so 2 li steps lower then yours, and so exactly in line with my determined system( 160-140 = 2x10kmph so 2 li steps lower.
So when I get your real weight, and there is still daubt about it, I can calculate a highest pressure with no screws bumping loose, and livetime of 6 to 10 years.
Your original tires lasted 9 years, so I understand.
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