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Care Guide

Advice from The Michelin Man on tyre pressure checks

Michelin 27 Jan 2011

Tyre Pressure

Make sure you check your tyre pressures (including the spare) at least once a month and before any long journeys

By keeping your tyres at their correct pressure, you’ll reduce your running costs. Under inflated tyres are prone to overheating use more fuel and wear out more quickly. Likewise, over inflation can reduce tyre life, reduce grip and cause steering problems.

WEAR.  A tyre which is 20% under- inflated can give 20% less mileage. That means a loss of 5,000 miles (8,000 km) on a potential mileage of 25,000 miles (40,000 km).

• FUEL CONSUMPTION AND CO2 EMISSIONS
. Low tyre pressure increases both fuel consumption and CO2 emissions.
A tyre loses some of its pressure through natural causes (typically around 1 psi (0.076 bars) per month). Pressure loss may be accelerated by other air leaks due to:
an accidental puncture
the valve: which must be changed each time a tyre is changed.
the valve cap: essential to guarantee an airtight seal.
the wheel: which should be cleaned each time a tyre is fitted. • Follow the advice of the vehicle or tyre manufacturer, particularly with regards to the conditions of use (loads/speeds etc.)
• Check pressures when the tyres are cold (tyres which have not been used in the last 2 hours or have covered less than 2 miles (3 km) at low speed).
• If tyres are hot when they are checked, add 4 to 5 psi (0.3 bar) to the pressure recommended by the vehicle manufacturer. Re-check the pressures when the tyres are cold.
• Never deflate a hot tyre.
• Even if tyres are inflated with nitrogen, the pressures and overall tyre condition must still be checked frequently.

A correctly inflated tyre improves safety, is more economical in use and is better for the environment.

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