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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.

Should all my tyres be the same?

Hi, I recently bought a second hand car and noticed one of my rear tyres is a slightly different size (245/45 R18) to the three other tyres (245/40 R18). I am due an NCT in March; can you tell me if this would contribute to a fail? Are there any other downsides to this? Car rides and handles perfectly.

Thanks, Andy K (Kildare)

Do I need to replace old tyres that appear fine still?

Hi, just wondering what the story is with tyres that are six or more years old. Mine passed in August with pass advisory and my NCT is up in a couple of weeks, but the tread on the tyres isas good as new as it has only done 2,000 miles. Will I need new tyres or will they go by condition of the set I have?