Some leaks only appear under conditions, and those are the ones that get dismissed as imagination. A tyre that holds pressure perfectly on a cold morning and loses several pounds after a run has a leak that opens when the tyre flexes and warms. A crack in the bead area, a marginal seal at the valve, or a small split that closes when the rubber is cold will all behave that way. Check it in the morning and everything is fine, so nobody believes there is a problem.
The way to catch it is to check after use rather than before, and to compare that reading against what the tyre reads cold. If it has gone down after a drive rather than up, something opened. When we come out, the tyre goes off the rim and gets tested under pressure, which finds these regardless of temperature, because the test does not depend on the tyre being in the mood.
Somebody waiting to be collected turns a puncture into an emergency faster than anything else. The work happens at the car in N22: wheel off, tyre inspected from the inside, internal repair to British Standard where the damage sits inside the limits. On Westbury Avenue, day or night, Bowes Park included, arrival across N22 runs 30 to 60 minutes. We are out on the North Circular at 2am and in Turnpike Lane at 2pm.

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Much of the driving around Wood Green is short and slow between the High Road, Lordship Lane and Westbury Avenue, which means tyres rarely get properly warm and an intermittent leak can hide for months. If a tyre only ever seems low after a longer run out to the North Circular, that is a pattern worth mentioning when you ring, because it changes where we look first.
Air expands as a tyre warms, so a reading that falls after use rather than rising means something opened up under flex and heat.
Small splits and marginal seals can seal themselves when everything contracts. It is why a morning check keeps saying the tyre is fine.
Extra weight flexes the sidewall further and pushes the bead harder against the rim. A marginal seal that copes empty can let go loaded.
Yes, and it is a real pattern. Some leaks open under heat and flex and close again when everything cools.
Read the pressure cold, drive normally, then read it again. A reading that has fallen rather than risen is the sign.
Yes. Testing the tyre off the rim under pressure does not depend on the weather or on how the car has been used.
Typical arrival across N22 is 30 to 60 minutes, whether you are at home, in a car park bay or pulled in off the High Road.
That depends what we find. A tread puncture in the repairable band is. A bead or a wheel problem gets dealt with differently and you are told which before anything is charged for.
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