Is it finished, or is it only marked? That is the whole question, and the answer comes down to whether the damage has reached the structure of the tyre or stopped in the rubber.
London Colney produces a particular mixture. There is aggregate and stone off the lanes around Tyttenhanger and out towards Frogmore, which cuts tread. There is debris off the M25 and the A414, which arrives at speed and tends to gash or pinch. And there is slow kerb wear from the narrow old high street, where getting past parked cars means brushing the edge more often than anybody admits.
Cuts that reach the woven cord underneath are terminal. Swellings on the sidewall mean the cords have already parted. Fine cracking across the wall is age, which matters on a car that sits still for weeks at Shenley or Colney Heath. Grazes that have reached none of that are simply grazes, and we will say so.
A car that has been sat unused for months often needs tyres before it needs anything else. We can look at it where it is parked in Tyttenhanger, tell you which of the four are genuinely past it, and fit replacements there without the car making a journey it is not really fit for. Level in Colney Heath, sloping in Shenley: we set the car straight first. Underground parking in Frogmore or Tyttenhanger is worth flagging.

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Damage here arrives from two directions. Fast road debris off the M25 and the A414, which tends to be structural and sudden, and slow attrition from stone on the lanes towards Tyttenhanger and kerbs in the narrow high street. The first often hides on the inside of the casing, so it is worth having the tyre taken off rather than judged from the outside.
A sharp piece of aggregate had worked its way into the tread band and opened a slit that showed cord at the base. That tyre was finished. The three others were sound, so one cover went on and nobody was talked into a set of four.
Something picked up near junction 22 had pinched the sidewall against the rim without leaving much to see. With the tyre off, the inner surface carried a clear crease all the way round where the casing had folded. That damage is invisible from outside, which is why the tyre comes off.
A second vehicle kept at a house in Shenley had almost full tread and sidewalls covered in fine crazing. The date codes were eleven years old. Rubber hardens on a driveway just as surely as on the road, and the advice was replacement on age.
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I would highly recommend Sohit. Got a damaged tyre late night, and contacted him. He responded exceptionally fast and fixed the tyre in a very professional manner at a very reasonable price.
The guy I spoke to on the phone was very friendly and understanding, especially as having two tyres needing to be replaced was quite stressful. He arrived quickly, talked me through everything, and gave me honest advice. He also went above and beyond by checking other things on the car and explaining the condition of all my tyres.
I have an electric car, and it was very difficult to find the right tire in an emergency. Ali came incredibly quickly, almost at midnight, and got the job done very fast. He was extremely friendly, professional, and helpful, and really went above and beyond to help me when I needed it most.
Depth, mostly. A scuff sits in the outer rubber and the surface beneath it is continuous. A split opens as the wheel turns and often shows the weave of the cords at its base. If it is not obvious from outside, the tyre comes off the rim and we look at the inner surface instead of guessing.
It is common after a single event. Dropping both wheels on one side into the same pothole damages both, and the rear often takes the worse hit because it arrives with no warning and no steering input. We check both rather than only the one you noticed.
It is urgent in the sense that the tyre should not be driven on. A bulge is a failed casing still holding pressure, and it lets go without warning rather than deflating politely. On the A414 or the M25 that is not something worth gambling on for the sake of a few days.
The week and the year the tyre was made, so 2419 means the twenty fourth week of 2019. We read it as a matter of course, because tread depth tells you about wear and the date code tells you about the rubber, and both matter to how a tyre behaves.
Yes. A fair number of these calls end with the same tyre going back on the car. Being the people who tell you a mark is only a mark is worth considerably more to us than the sale of a tyre you never needed.
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