A fair number of people ring us having known about this for weeks. There is a tyre that wants air every few days and a routine has grown up around it: top it up at the garage on the way home, forget about it, top it up again. The routine works right up until the morning it does not, usually on Leighton Road with somewhere to be.
The reason to deal with it before then is not only the inconvenience of being caught out. A tyre run persistently under pressure is being damaged the entire time. The sidewalls flex more than they were designed to, which builds heat, and heat is what separates the rubber from the cords inside it. The tread wears unevenly at the shoulders, so even once the hole is dealt with the tyre may be past its best. And the hole itself is not staying the same size. A nail sitting in a tyre works about as the tyre flexes and quietly enlarges the wound around it, so a puncture that was neatly repairable in week one is sometimes not repairable at all by week four. Topping up is not a fix that buys time. It is a fix that spends the tyre.
The instinct is to nurse it to a garage, and it is usually the wrong one. Driveways in Gospel Oak, side streets, car parks and the hard shoulder are all normal ground for us. Blocked drive in Kentish Town? Open kerb in Tufnell Park? Either works. Which street in Gospel Oak, which way the car sits in the Fortess Road area, and we are set. A NW5 address in Highgate Road and one in Leighton Road terraces are the same round.

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Kentish Town is dense, permit controlled and parked solid, which is exactly why so many people here live with a slow puncture rather than dealing with it. Moving the car is a nuisance, so the compressor at the garage becomes the routine. It is a routine that costs you the tyre in the end. Have it sorted while the car is sitting in its space, whether that is off Fortess Road or up towards Gospel Oak, and it stops being something you think about every few days.
The screw had been in there long enough to have worn an oval hole around itself. A repair in the first week would have been routine. By the time we saw it the damage was too large to patch legally, and that was the topping up rather than the screw.
It had been going down slowly for a fortnight and finally went properly during the morning rush. That is what a known slow puncture eventually does. It picks its own moment, and the moment is never a good one.
She had been putting air in for a week and decided to stop doing that. We came to the permit bay off Highgate Road, took the wheel off and repaired it to BS AU 159. Under half an hour, and the routine was over.
Yes. Air is leaving through a hole, and that hole is getting worse rather than better as the tyre flexes around it. Repairing it early is often possible and repairing it late often is not.
It can. Underinflation makes the sidewalls flex more than they were built to, which generates heat and starts breaking down the bond between rubber and cords. It also wears the shoulders of the tread unevenly.
It could, and that is worth checking rather than assuming. Valves perish and sensor seals fail, and either will let air out slowly. The valve gets looked at as a matter of course once the tyre is off the rim.
It is a risk with no upside. A slow leak becomes a sudden one at a moment of its own choosing, and around Kentish Town Road that tends to be in traffic. Half an hour ends it properly.
Yes, and that is most of what we do here. The terraces off Leighton Road are parked solid, so tell us the street and the registration and we bring the kit to the car rather than the other way round.
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