Sometimes you look at the tyre and there is nothing to see. No nail, no gash, no obvious cause, just a wheel that is flat. That is unnerving and it is entirely normal, because a good share of sudden deflations come from a valve that has failed, a bead that has let go off the rim, or an object that has already worked its way back out leaving a hole you cannot spot. None of those show themselves from the outside. It also means there is no point crouching in the road hunting for a cause: the answer arrives when the tyre comes off the rim and can be looked at properly from the inside.
So leave it and wait somewhere sensible. Chertsey does not offer many good places to be stuck, with the M25 at Junction 11 to the east, the M3 to the north and the A317 and A320 carrying traffic over the bridge and past the theme park in surges. If you are on a motorway approach, get onto the hard shoulder, out of the car on the nearside and behind the barrier. If you are caught in the visitor traffic on the A320 or on one of the narrow old-town streets around Guildford Street, simply stop where you can and stay put. We come out with the tyre, the tools and the answer to what actually caused it.
Catching a flat early is worth real money. A tyre that is losing air slowly, spotted while it is still parked up in Longcross, is very often repairable; the same tyre after ten miles of being driven on is scrap. The wheel comes off in Lyne, not on a ramp in Egham. Nothing is towed out of Longcross or Ottershaw; the work finishes there.

Flat tyre help in Chertsey is part of our wider mobile puncture repair cover. For flat tyre help in Chertsey, call 07717 389637 or get a price for your tyre.
Chertsey is boxed in by fast roads and a river crossing, which leaves very little margin when a tyre lets go. The M25 sits at Junction 11 to the east and the M3 to the north, the A320 fills and empties with theme park traffic in waves, and the old town streets around Guildford Street and Chertsey Bridge are narrow and full of parked cars. Nowhere in that is a good place to jack a car up, and nothing about the cause of a sudden flat can be worked out until the tyre is off the rim anyway. Stopping, standing clear and waiting is the entire correct response.
The owner had gone over the tyre twice looking for a nail. There was not one. The valve had failed and the tyre itself was undamaged, which is a much better outcome than the one they were braced for.
A sudden deflation with no puncture at all. The tyre had come off the seat on the rim, which is invisible from the outside and obvious the moment the wheel is off. Nothing about that could have been diagnosed at the kerb.
Visitor traffic backing up and a tyre going down in the middle of it. The driver worked out to the side and stopped rather than crawling along with everyone else, which kept the wheel undamaged.
Very likely a valve, a bead that has come off the rim, or an object that has fallen back out. None of those are visible from the outside, which is why the answer comes when the tyre is off the wheel rather than at the roadside.
There is no need, and on a busy road it puts you where you should not be. Stand clear of the car and let the inspection happen when the wheel is off and it can be done properly.
No. Get onto the hard shoulder, leave by the nearside doors and wait behind the barrier well back from the car. We attend motorway-side callouts and change the wheel on the spot.
Yes. The streets around Guildford Street and the bridge are tight and parked, so the car stays in whatever space it has and we work beside it from the road side.
Typically 30 to 60 minutes at any hour, whether that is a driveway in Ottershaw, a lane out towards Lyne or Longcross, or the roadside on the A317.
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