Reasons for Insufficient Tyre Pressure

The reasons for insufficient tyre pressure include:

1. The tyre was not inflated to the correct pressure when initially fitted, or the pressure has not been checked and topped up regularly over time;

Solution: If you have an onboard air pump, inflate the tyre and then visit a nearby garage for inspection;

1. A puncture caused by nails or other sharp objects while driving, leading to air leakage and low pressure;

Solution: Repair or replace the tyre;

1. Air leakage from the tyre valve;

Solution: If the valve itself is faulty, the valve core or entire valve assembly may need replacing. If the leak is due to ageing, the valve should be replaced;

1. Deformation of the wheel rim compromising the tyre's airtight seal;

Solution: The wheel rim must be replaced;

1. Long-term overloading of the vehicle causing uneven weight distribution across tyres;

Solution: Replace the wheel rim, avoid overloading, and adjust driving habits to distribute weight more evenly;

1. Manufacturing variations in tyres may lead to pressure loss through thermal expansion and contraction;

Solution: Consider inflating with nitrogen to minimise the effects of thermal expansion and contraction.

Correct inflation is the most crucial factor in tyre maintenance. Neither tyres nor inner tubes are completely airtight. To avoid the dangers of underinflation, any air lost from tyres must be replenished.

Furthermore, a 20% deviation from recommended pressure can result in over 20% loss of mileage, making it essential to maintain the correct pressure for your vehicle's specifications. Inflation pressure directly impacts tyre performance, including tread life and durability.

Both underinflation and overinflation lead to unnecessary costs and safety risks. Tyre lifespan, ride comfort, traction and braking performance are all affected by incorrect pressure. For commercial vehicles, inflation pressure must be appropriate for load capacity, speed and operating conditions. Maintaining correct tyre pressure is fundamental to road safety.

Low tyre pressure is typically caused by gradual air loss, punctures, temperature changes, or faulty valves. Tyres naturally lose around 1-2 PSI per month due to permeation. Punctures from nails or debris can lead to slow leaks. Cold weather reduces pressure (roughly 1 PSI per 5°C drop), while faulty valve stems or corroded rims may also cause air loss. Regular checks (at least monthly) are essential.

1. Gradual air loss: All tyres lose pressure over time. Check monthly, especially before long journeys.
2. Punctures: Small objects like screws may cause slow leaks. Inspect treads and sidewalls.
3. Temperature fluctuations: Cold weather contracts air, reducing pressure. Top up in winter.
4. Valve or rim damage: A cracked valve stem or corroded alloy wheel can leak air. Replace if faulty.

Underinflated tyres increase fuel consumption, reduce grip, and wear unevenly. Use a reliable gauge and refill to the manufacturer’s recommended PSI (found in the manual or door jamb). For EVs like the Tesla Model 3, correct pressure is critical for range efficiency.

From a safety perspective, low tyre pressure compromises handling and braking distance. A tyre 20% underinflated can increase stopping distance by several metres in wet conditions. It also raises the risk of blowouts at motorway speeds. Always check pressures when tyres are cold for accuracy. Modern cars like the Ford Focus often have TPMS (Tyre Pressure Monitoring Systems), but manual checks remain vital.