Probably a daft question: bicycle sized dust caps on car wheels?

You have a faulty valve or a puncture or a rim fault . Just fix it.
Mind you, tyres can be fickle blighters. I check pressures regularly but a couple of years ago a front tyre on my old 5 series was looking soft & when I checked it was down to less than one bar, which is barely half the correct reading.
Thinking it was at least worth airing it up before dragging out the spare (yes the car has one & it's full size .. remember them?) I checked the valve, inflated to the correct pressure & continued to check the tyre on a daily basis over the next couple of weeks .. it has never deflated since :unsure:

Considering there are no children within miles (we live on a retirement park) mischievous tampering can probably be discounted, so the mystery remains unsolved to this day.
 
Mind you, tyres can be fickle blighters. I check pressures regularly but a couple of years ago a front tyre on my old 5 series was looking soft & when I checked it was down to less than one bar, which is barely half the correct reading.
Thinking it was at least worth airing it up before dragging out the spare (yes the car has one & it's full size .. remember them?) I checked the valve, inflated to the correct pressure & continued to check the tyre on a daily basis over the next couple of weeks .. it has never deflated since :unsure:

Considering there are no children within miles (we live on a retirement park) mischievous tampering can probably be discounted, so the mystery remains unsolved to this day.
More likely the valve hadn’t seated after the previous inflation.
 
Kerbing, can cause some temporary loss of pressure.
Yes hitting a curb can almost remove a tyre if it is sharp enough, once you reinflate the damage may no longer be visible, a tyre badly fitted to a rim could be fixed by deflating and then reinflating to seat the tyre differently.
 
Yes hitting a curb can almost remove a tyre if it is sharp enough, once you reinflate the damage may no longer be visible, a tyre badly fitted to a rim could be fixed by deflating and then reinflating to seat the tyre differently.
99% sure there was no kerb contact & the car has been through two MOT's since the incident w/o even advisories, so if there is tyre damage it hasn't been picked up by the tester.

I don't have any concerns, but thanks to all for the advice/theories.
 
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swap the suspect cap to a different wheel, and put the known correct one on your suspect wheel.
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A cap for a Schrader valve is a cap for a Schrader valve whether it is fitted to a lorry, car, motorcycle, quad bike, pushbike or wheel barrow.
 
A week ago I had a new tyre fitted.
Was driving for a week before noticing that the dust cap was missing.
Having no spare, I took one from a bicycle in the shed.
Overnight I lost about 10psi (31 down to 20).

Have repumped, and loosley put the cap back on. Hoping that the cap was just too small, and allowing a tiny bit of air to be released.

Does this sound likely? I will probably find out when I get out of work to go home ...
What was the outcome?
 
You don't like laughing at the Cons?

Please feel free to trawl through my recent posts. You will find I am no fan of Tories. You will also find I have no faith in any politicians of any colour.

Your abbreviation of the word 'Conservative' is however, correct.

Also - you are going off topic for the motoring section. You may have to report yourself....................................................................to yourself. :LOL:
 
Also - you are going off topic for the motoring section. You may have to report yourself....................................................................to yourself. :LOL:
He could private message a warning to himself like he did to me a while back.
 
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