Tyre Pressure: Why the Door-Jamb Value Matters

Learn the difference between vehicle-recommended pressure and the maximum printed on a tyre sidewall.

The pressure printed on a tyre sidewall is typically a maximum rating, not the normal pressure you should automatically use. The vehicle manufacturer’s placard—often on the driver door jamb, fuel door or manual—provides the cold inflation recommendation for the original configuration.

Measure pressure when tyres are cold. Pressure rises during driving as tyres warm. Underinflation can increase heat and fuel use; overinflation can affect ride, grip and wear. Loads, replacement tyre sizes and special conditions may require guidance from the manufacturer or a tyre professional.

Inspect tread, cuts, bulges and uneven wear at the same time. Pressure monitoring systems are useful but do not replace visual inspection.