Cold tyre pressure: measurement and a check log

A repeatable cold check

Check at least monthly and before long trips. Park for at least three hours, find the vehicle pressure specification, and measure each tyre and the spare with a gauge. Correct according to the appropriate cold target and recheck. Repeated loss or damage needs diagnosis, not just more air.

Source: NHTSA — Maintenance: Tire Pressure

Warm pressure is not a new target

Pressure normally changes as tires warm in use and as ambient temperature changes. The published recommendation is normally a cold setting. Do not release air from a warm tire merely because its reading is above the cold value; let it cool and verify again unless the manufacturer gives a different procedure.

Source: NHTSA TireWise — Maintenance: Tire Pressure; Maintaining Proper Tire Pressure

Record measurements

For each wheel, record date, time parked, ambient conditions, unit, specified cold value, measured value and any correction. Keep readings from the same gauge. A recurring difference helps the technician investigate a leak; a log does not certify tyre condition.

When to stop and inspect

Do not continue normal use after rapid or repeated pressure loss, a bulge, exposed material, separation, smoke, unusual heat or odor, strong vibration, impact damage or unstable handling. Unload safely and use the specified spare or roadside assistance where needed. Correcting pressure cannot rule out hidden internal damage.

This page explains how to find the applicable instruction; it is not a pressure lookup or vehicle approval. Exact values depend on the vehicle, axle loads, tires, wheels, trailer, speed, temperature, manufacturer documentation and jurisdiction.

Tyre pressure: find the correct setting