I need a bit of help with my tyre pressures...

Hi guys,

My tyre pressure is usually 30psi all round and car is almost always empty and without passengers. I've to do a drive of about 350km round trip soon with three passengers and a fully loaded boot. Mostly motorway. Should I up the tyre pressures all round and to what, please?

Also, after a recent puncture the garage told me I should keep the spare at 50psi. This sounds ridiculously high and potentially dangerous if you needed to put the spare tyre on in an emergency where you couldn't check the pressure. Would be glad of any tips, thanks.

Elaine Edwards (Navan)

May 2015 Filed under: tyres

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Expert answer

Hi Elaine,

We'd suggest you up your tyre pressures all round by 2psi if you're going to be carrying that many more people, but as we don't know what type of car you have it's best to follow the manufacturer advice. There's usually a diagram showing the correct ratings either inside the fuel filler flap or on one of the front door frames - visible with the door open only.

It's not unusual for tyre fitters to recommend putting a higher pressure in your spare, but really we'd say that's too high. Stick to 40psi if it's a spare that's not easily accessible and checked often, as it will likely lose pressure over time. If, however, it's easy to get at, keep it at the right pressure and check it monthly.

Hope that all helps

Shane O' Donoghue - Complete Car Adviser
@Shane_O_D