The Effects of Inflation Gas on Tire Laboratory Test Performance

Under-inflated tires are a significant problem. According to a NHTSA study, 27% of passenger cars and 32% of light trucks have at least one tire that is substantially  underinflated. Tires lose inflation gasses continuously, since rubber compounds are permeable to gas molecules. Tubeless tires require an innerliner compound, with low permeability, to limit the loss of inflation. The ASTM F1112-06 test measures the loss of inflation gas from a tire over time (Data is reported as % loss / month)