Tire Psi

…cold tire is one that has traveled one mile or less, or has cooled for three to four hours. Ambient temperatures are a consideration when setting tire pressures. A 10-degree Fahrenheit (F) change in ambient temperature equates to about a 2% change in tire pressure. For example, 50 psi tire pressures…

…1 psi per month regardless of temperature. This means that if you had set your tire pressure at 36 psi on a 70 degree summer day (six months ago) and the pressure has since dropped to 30 degrees, your tires at this moment could have as little as 26 psi in them. Checking your tire pressure…

…(H-Speed Rated Tires) Recommended High Speed Pressure & Load Capacity Adjustments For H-Speed Rated Tires Vehicle Top Speed Required Tire Pressure Increase Tire Load Capacity % of Branded Maximum H-Speed Rated Tire 35 psi O.E. Example mph km/h psi bar % of value branded on sidewall psi lbs. 100 160…

…P-metric and LT tires: Tire Load Ranges Inflation Pressure Assigned For 'Maximum Load' Ratings P-metric Light Load (LL) 35 psi Standard Load (SL) 35 psi Extra Load (XL) 41 psi Light Truck Load Range C (LRC) 50 psi Load Range D (LRD) 65 psi Load Range E (LRE) 80 psi P-metric tires used on passenger…

…35 psi (240 kPa)*** Load Range D (LRD) 65 psi (450 kPa)*** 50 psi (350 kPa)*** Load Range E (LRE) 80 psi (550 kPa)*** 65 psi (450 kPa)*** Load Range F (LRF) 95 psi (650 kPa)*** 80 psi (550 kPa)*** ***Select LT sizes are designed with modified maximum load pressures. Never exceed the tire's maximum…

…paper. Tire sidewalls are extremely pliable and soft; the entire load of your vehicle is carried by the air that fills the tires. For every 10-degree Fahrenheit shift in ambient air temperature, you can expect a fluctuation of 1 psi in tire pressure. Also, you'll lose on average 1 psi per month…

…(R-Speed Rated Tires) Recommended High Speed Pressure & Load Capacity Adjustments For R-Speed Rated Tires Vehicle Top Speed Required Tire Pressure Increase Tire Load Capacity % of Branded Maximum R-Speed Rated Tire 35 psi O.E. Example mph km/h psi bar % of value branded on sidewall psi lbs. 100 160…

…(S-Speed Rated Tires) Recommended High Speed Pressure & Load Capacity Adjustments For S-Speed Rated Tires Vehicle Top Speed Required Tire Pressure Increase Tire Load Capacity % of Branded Maximum S-Speed Rated Tire 35 psi O.E. Example mph km/h psi bar % of value branded on sidewall psi lbs. 100 160…

…(T-Speed Rated Tires) Recommended High Speed Pressure & Load Capacity Adjustments For T-Speed Rated Tires Vehicle Top Speed Required Tire Pressure Increase Tire Load Capacity % of Branded Maximum T-Speed Rated Tire 35 psi O.E. Example mph km/h psi bar % of value branded on sidewall psi lbs. 100 160…

…(U-Speed Rated Tires) Recommended High Speed Pressure & Load Capacity Adjustments For U-Speed Rated Tires Vehicle Top Speed Required Tire Pressure Increase Tire Load Capacity % of Branded Maximum U-Speed Rated Tire 35 psi O.E. Example mph km/h psi bar % of value branded on sidewall psi lbs. 100 160…

…pressure in 2 psi increments. Type of Vehicle Position Pressure Front Engine/Front or All-Wheel Drive Front Rear 40-45 psi 30-40 psi Front Engine/Rear Wheel Drive Front Rear 35-45 psi 30-40 psi Mid- or Rear-Engine Front Rear 35-45 psi 35-40 psi When racing on DOT approved tires air pressure is…

…the tire in kilopascals (kPa) and pounds per square inch (psi). These values can also be found in the industry's tire load & inflation charts. Related Links * Tire Specs Explained: Measuring Rim Width * Tire Specs Explained: Overall Diameter * Tire Specs Explained: Revolutions Per Mile * Tire Specs…

…6 psi 19% Underinflated by between 3 & 6 psi 29% Underinflated by up to 3 psi 21% Inflated between recommended pressure and up to 3 psi 7% Overinflated by between 3 & 6 psi 10% Overinflated by more than 6 psi The lowest tire inflation pressure measured was just 9.5 psi (20.5 psi low due to the tire…