Cold Tyre Pressure: Check the Vehicle Label First

Cold tyre pressure: find the vehicle label first, then look at the tyre

Scope: general passenger cars; pressures and axle positions follow the vehicle's own manual and label; no universal figures are given

Which figure to compare against

The pressure marked on the tyre sidewall can't be taken as your car's everyday target; NHTSA says to check the vehicle's tyre information label or owner's manual. Even if two cars in the family use the same tyre, don't copy one car's inflation record for the other. First record the front and rear axle targets, the unit and the actual readings, then judge any deviation, so the technician can tell a wrong specification from a problem with one tyre. ^[1]

Make your records comparable

This article suggests always recording under NHTSA's definition of cold tyres, with the car not driven for at least three hours, noting whether it has just been driven, the weather and the gauge used. Don't compare a reading taken after motorway driving with one taken the next morning, and don't set front and rear axles to the same pressure just to make the numbers match. If the label is unclear or information conflicts after fitting different tyres, ask a professional tyre shop to check the vehicle's approved specification first. ^[1]

How to hand over a problem

If one tyre keeps losing pressure, the sidewall is damaged or the car feels unstable, stop treating topping up as a long-term fix and arrange an inspection; with obvious damage, avoid driving on and call for roadside assistance. Give the workshop the wheel position, several readings, the intervals between them and any kerb strikes, without first deciding it's the valve core. When the job is closed, keep a record of the position and parts actually found and replaced, so you can track whether the problem comes back. ^[1]

Sources

[Source 1] NHTSA: Tires
https://www.nhtsa.gov/vehicle-safety/tires
Verified: 2026-10-03; page publication date not confirmed.

This article contains information-organising suggestions from the editorial team; it is not a manufacturer repair procedure.