Understanding Tyre Pressure — A Complete Guide for UK Drivers

Why Tyre Pressure Matters

Maintaining correct tyre pressure is one of the simplest and most important aspects of vehicle maintenance. Under-inflated or over-inflated tyres affect braking distances, fuel consumption, handling and tyre longevity — and can cause dangerous blowouts.

How to Find the Correct Tyre Pressure for Your Car

Your vehicle's correct tyre pressures are found in:

• The driver's door jamb sticker (most common location)
• The inside of the fuel filler cap
• Your vehicle handbook
• The tyre manufacturer's website (by vehicle make and model)

Note: many cars have different pressures for front and rear tyres, and often a higher pressure for carrying full loads. Always check both specifications.

PSI vs Bar — Which Units to Use

UK vehicles use both PSI (pounds per square inch) and bar. Most forecourt air compressors offer both. Typical car tyre pressures range from 28–36 PSI (1.9–2.5 bar) for standard cars. High-performance vehicles and SUVs may require higher pressures.

Signs Your Tyre Pressure Is Wrong

Under-Inflation Signs

• Tyres look noticeably flat or squashed
• Car pulls to one side
• Sluggish, heavy steering feel
• Increased fuel consumption
• Rapid tread wear on the outer edges

Over-Inflation Signs

• Harsh, bouncy ride quality
• Centre tread wearing faster than edges
• Reduced grip, especially in corners

How Often to Check Tyre Pressure

Check tyre pressure at least once a month and always before long journeys. Check pressures when tyres are cold — driving heats the air inside and gives a falsely high reading. Wait at least 30 minutes after driving before checking.

TPMS — Tyre Pressure Monitoring Systems

All new cars sold in the EU and UK since 2014 are fitted with a Tyre Pressure Monitoring System (TPMS). This dashboard warning light means pressure has dropped by 25% or more — by this point, the tyre is already significantly under-inflated. Use TPMS as a warning, not a substitute for regular manual checks.