A tyre that loses a few pounds a week and never shows a nail is usually leaking where the rubber meets the metal. Leave it and you are topping it up every weekend until the weekend you forget, and then you are out on the A23 on something soft, the sidewall flexing itself apart in traffic. The leak is rarely the tyre's own fault. It is the bead, the hard reinforced edge that clamps against the rim, and it gets hurt when somebody levers a tyre on with irons, sets the machine head too close, or bangs it home dry without lubricant.
What we look for once it is off the wheel is a nick or a chewed section on the bead itself, and very often a matching score on the rim flange. Neither of those is a repair. A cut bead means a new tyre, and a damaged or corroded rim edge has to be cleaned back and sealed or the next tyre does the same thing. The useful part is being told that what you have been chasing was never a puncture. Sometimes the news is better and the seat only needs cleaning up and remounting.
An MOT advisory about a tyre is a warning with a date on it. We can look at the car where it sits, in Streatham town centre or Streatham Park, and give you a straight view, then fit the replacement there and then if that is what it needs. Whether it is Furzedown in rush hour or the South Circular at midnight, we answer. On Tooting Bec Gardens, day or night, Furzedown included, arrival across SW2 runs 30 to 60 minutes.

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Tyres round here come on and off wheels more often than in most places, because the road surface and the kerbs on the High Road destroy them regularly. Every one of those refits is a chance for a bead to get nicked or a rim seat to get scored, and the fault often shows up weeks later as an unexplained soft tyre. If you have had a tyre changed lately and that corner keeps going down, that is where to look.
No nail, no obvious damage, and pressure gone by the following Saturday. Off the rim it was a bright nick in the bead where a tyre iron had been used, sitting against a rim edge with the same mark on it.
Alloys corrode under the bead where salt and water sit. The powdery crust holds the tyre off the metal just enough to breathe. Cleaning the seat back to bare aluminium and remounting solves it, and no new tyre was needed.
A hard hit against a kerb can bend the rim flange out of true even when the tyre survives. The tyre then holds air for days at a time. That is a wheel problem and we will say so.
It is a nuisance right up until it is not. A tyre run persistently below its pressure overheats in the sidewall and destroys itself from the inside, and you get no warning of the moment it stops being fine. Chase it down while it is a nuisance.
Sometimes. A bead leak often shows as bubbles round the rim edge with the wheel wet. But finding roughly where it is coming from is not the same as knowing what caused it, and the cause is on the other side of the rubber.
It is a genuinely good test and costs nothing. Washing up liquid in a spray bottle, wet the whole tyre including the rim edge and the valve, and watch for foam. Do not stop at the first bubble, because there is often more than one.
It goes with us. The old casing leaves in the van and is disposed of properly, so you are not left with something in the hallway or the boot that you then have to find somewhere to take.
Yes, and it takes a couple of minutes. Pressures, tread across the width rather than just in the middle, and a look along the walls for cuts and bulges. Most of what we spot that way is nothing, which is worth hearing too.
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