Glossary

Load range

Last reviewed: 2026-05-20

A letter-based strength classification for tires that groups them by maximum cold inflation pressure and load capacity. Common highway truck tire load ranges are G (maximum 110 PSI) and H (maximum 120 PSI), with F (95 PSI) in some lighter applications and L (130 PSI) for heavy vocational use. The load range letter appears on the tire sidewall as part of the service description — for example, "G" or "LR G" — and corresponds to a specific maximum cold inflation pressure and maximum rated load at that pressure. The correct load range for an application is determined by comparing the actual axle load to the manufacturer's load and inflation table for the specific tire model and size.

Do not approve a tire substitution by load range letter alone — confirm the exact capacity from the manufacturer's load and inflation table for the specific tire model. Two tires with the same load range letter from different manufacturers may have different actual load capacities at the same inflation pressure. The load range letter identifies the category, but the manufacturer's table provides the working numbers for a complete decision. When replacing a tire in a matched set, also verify that the overall diameter of the new tire is within acceptable mismatch tolerance for the position.

Real-World Use

A fleet maintenance manager receives two competing quotes for 11R22.5 drive tires — one Load Range G and one Load Range H. The fleet spec requires H-rated tires based on the loaded tandem axle weight calculation. The lower-priced G-rated option looks attractive, but a check against the manufacturer's load and inflation table confirms that at the fleet's operating inflation pressure, the G-rated tire's dual capacity falls short of the required per-tire load. The H-rated tires are required for that application.

What to Pair It With

Read this term with the full tire sidewall, vehicle rating information, manufacturer documentation, and the actual condition of the tire.

This site is for general information only. It does not replace professional tire service, DOT compliance advice, tire manufacturer instructions, vehicle manufacturer recommendations, or fleet policy.