The seal on a tubeless tyre is made between the tyre bead and the inside lip of the rim, and it depends on both surfaces being clean and true. Kerb a wheel hard enough and you can flatten a section of that lip or leave a burr on it, and from then on the tyre leaks slowly past the bead no matter how many times somebody looks for a nail in the tread.
That is the frustrating slow puncture nobody can find, and it is common on cars that have taken a knock on Barnet Hill or against a kerb on a steep street. Diagnosing it means breaking the tyre off the rim and inspecting the lip, which is exactly what we do rather than swapping tyres and hoping. If the rim is the problem you will be told, and fitting a new tyre onto it will not be recommended, because it will leak in the same way. If the tyre is at fault, that is straightforward.
Winter leaves the roads worse than it found them, and tyres pay for it in March. A wheel dropped into one on the M25 near junction 23 can split a tyre from the inside without leaving a mark you would notice. Great North Road, the A1 and the streets around Hadley sit inside EN5. Valve in Arkley, balance in Hadley, pressures before we go. Balancing, valve, pressures: done in Arkley, on a Hadley drive, or on the A1.
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Barnet spreads a long way, from the streets around High Barnet and Chipping Barnet out to the lanes at Arkley and Hadley, and it is hilly enough that kerb strikes are a regular event rather than a rarity. A leak that nobody can find in the tread is very often sealing past the rim instead. Getting the tyre off the wheel and looking at the lip is the only way to settle it, and we do that where the car is parked.
A car that had struck a kerb on Barnet Hill kept losing air with no nail anywhere. The rim lip was damaged and that was the leak.
An older alloy in Arkley had corrosion on the sealing face. It was cleaned back and the tyre held pressure again properly.
A driver near New Barnet had already replaced one tyre for a slow leak that continued. The rim turned out to be the cause.
Often it is leaking past the bead where the tyre seals to the rim, usually after a kerb strike or from corrosion. That only shows once the tyre is broken off the wheel.
Light corrosion can be cleaned back on the spot. A flattened or cracked lip needs proper wheel repair, and we will tell you honestly which you are dealing with.
Not if the rim is the cause. It will leak exactly the same way, which is why we would rather diagnose it than sell you a tyre that changes nothing.
A kerb strike is the usual cause, and the steep streets around High Barnet make those easy to collect. The damage is on the inner lip where you cannot see it.
Typically 30 to 60 minutes across Barnet, from Chipping Barnet out to Hadley, with common car, SUV and 4x4 sizes on the van.
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