Motoring experts are urging Birmingham drivers to check their tyre pressure as the city braces for a heatwave with temperatures forecast to reach a sweltering 39°C this week. The Met Office has issued a rare red heat alert for Wednesday and Thursday, prompting safety warnings from tyre manufacturer Davanti Tyres.
Why Heat Affects Tyre Pressure
According to Davanti Tyres, rising temperatures cause the air inside tyres to expand, increasing pressure and compromising the tyre structure. This can lead to overinflation, resulting in cracks, tears, or even a blowout. For every 10°C increase in temperature, tyre pressure can rise by around 0.1 bar, even if the car hasn't been driven. Although this seems minor, any change in pressure can cause problems, including reduced grip and longer braking distances due to rubber degradation.
Davanti Tyres advises: "If tyres feel hot to the touch, this is a clear sign they could be overheating. If you're travelling a long distance and realise your tyres feel hot, the best form of action is to wait a while for the tyres to cool down before resuming your journey."
When and How to Check Tyre Pressure
It is recommended to check tyre pressure each week during a heatwave, but only when the tyres are cold – several hours after the car was last driven. Adjusting pressure when tyres are warm can lead to underinflation once they cool down. Drivers can find their vehicle's recommended tyre pressures in the handbook, which vary depending on load. A detailed guide is available on the AA website.
Ensure You Have the Correct Tyres
Davanti Tyres also emphasises the importance of having the correct tyres for warmer months. If winter tyres are fitted, they should be swapped to all-season or specific summer tyres, as these are recommended when the average daily temperature exceeds 7°C. Using appropriate tyres can improve fuel efficiency and reduce wear, as winter tyres may become hard and brittle in hotter weather, increasing friction.
