Wheel/tyre losing 5-7psi in week: wheel or tyre to blame?

[BigR]

Can be a buckled wheel, which can be fixed cheaply. But if its happening to all 4, that sounds somewhat unlikely.

[leggly]

I had this problem on a BMW 5-Series, I binned the alloys and ran it on steelies for a couple of years. I never had a problem with steel wheels.

[waynecyclist]

If they are not cracked, get the beads cleaned up and refit the tyres with bead sealer

[RoVoFob]

BigR said:

Can be a buckled wheel, which can be fixed cheaply. But if its happening to all 4, that sounds somewhat unlikely.

I had a buckled wheel on my V70 with identical alloys. That was flagged in several MOTs and didn’t lose air. There’s no record of a buckled wheel on this S60, so think that’s unlikely here - especially, as you said, it affects more than one of the wheels.

My money’s on iffy valves for now. Will pick up a valve tool later.

[mikey_b]

Had this on my old Alfa 159. Turned out to be a cracked rim - not visible without the wheel being off and cleaned up. The tyre place I took it to initially were firm that it should be replaced entirely, but I took it to an alloy refurb place and asked their advice - they were happy to weld the crack. No more problems in the two further years I kept it.

The crack was on the inner side, so the weld wasn’t visible once remounted. Even WBAC didn’t notice when they crawled over it with their bloody paint thickness gauge, looking for any excuse to cut the price offered.

[Don1]

Before doing anything, try putting some soapy water around the valve. If it blows bubbles, you have your answer.

Then look at cleaning and resealing the wheel, before tyre/wheel replacement.

[remould]

This may sound like a micky take,but it's not,have you got valve caps and are they in good nick ?, no valve caps is another reason for loosing pressure

[RoVoFob]

remould said:

This may sound like a micky take,but it's not,have you got valve caps and are they in good nick ?, no valve caps is another reason for loosing pressure

The current tyres don’t have valve caps, but I wouldn’t have thought they prefer the valves losing air...they just protect the valves from damage, don’t they?