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255/50R18 tire load inflation table provides tire pressure psi corresponding to tire's weight load in pounds (lbs).
If your vehicle is carrying extra load, you might want to increase your tire pressure accordingly, but do not overinflate your tires above the maximum tire pressure level indicated on your tire sidewall. Remember that overinflating your tires does not increase their load carrying capacity.
Psi / Load Index
|26 psi||1444 lbs||1433 lbs|
|27 psi||1477 lbs||1466 lbs|
|28 psi||1499 lbs||1488 lbs|
|29 psi||1565 lbs||1554 lbs|
|30 psi||1631 lbs||1620 lbs|
|31 psi||1653 lbs||1642 lbs|
|32 psi||1687 lbs||1675 lbs|
|33 psi||1753 lbs||1742 lbs|
|34 psi||1786 lbs||1764 lbs|
|35 psi||1819 lbs||1797 lbs|
|36 psi||1874 lbs||1863 lbs|
|37 psi||1874 lbs||1896 lbs|
|38 psi||1874 lbs||1918 lbs|
|39 psi||1874 lbs||1973 lbs|
|40 psi||1874 lbs||2006 lbs|
|41 psi||1874 lbs||2039 lbs|
|42 psi||1874 lbs||2094 lbs|
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