P235/55R18 99 SL is a Standard Load tire with a load index of 99 and a maximum tire load capacity of 1738 lbs @ 36 psi, capable of supporting up to 1738 pounds or 788 kilograms when inflated to its maximum air pressure of 36 pounds per square inch (psi) or 248 kilopascals (kPa).
P235/55R18 102 XL is a Extra Load tire with a load index of 102 and a maximum tire load capacity of 1874 lbs @ 41 psi, capable of supporting up to 1874 pounds or 850 kilograms when inflated to its maximum air pressure of 41 pounds per square inch (psi) or 283 kilopascals (kPa).
Tire Load Capacity Calculator
Calculate proper tire load capacity for P235/55R18 (99 SL and 102 XL) tire within inflation range of 26 psi to 36 psi for SL or 41 psi for XL. Inflating P235/55R18 tire over 36 psi (SL) or 41 psi (XL) will not increase its maximum load carrying capacity of 1738 pounds (SL) or 1874 pounds (XL).
Replacement Tire Pressure Calculator
When replacing vehicle's original equipment tires with P235/55R18 (99 SL and 102 XL) tire, calculate proper replacement tire inflation based on original tire's load capacity at its recommended tire pressure. Never overload P235/55R18 tire above its maximum load capacity of 1738 pounds (SL) or 1874 pounds (XL).
Original Tire is LT-Metric
All listed data and/or calculations are for informational purposes only. TirePressure.com does not warrant or make any representations regarding the accuracy of or the results of the use of this information. Always refer to vehicle owner's manual for recommended tire pressure settings. Never overinflate or overload a tire beyond its maximum capabilities listed on sidewall.
Tires with P235/55R18 tire size
11 tire models are available in P235/55R18 tire size. Click on tire model to check its inflation and load capacity values.