A tyre can be finished without ever going flat, and in Molesey that combination turns up more than most places.
So what gets examined is the rubber rather than the depth. Fine cracking in the grooves of the sidewall, a hard shine across the surface, a date code from a decade ago. Any of those makes a tyre unfit whatever the gauge reads, because hardened rubber loses wet grip long before it runs out of pattern.
The second category here is impact damage. Narrow streets, tight turns and high kerbs produce pinched sidewalls, and pinched sidewalls produce bulges some weeks later. A bulge is not cosmetic: it means the casing cords have broken and only rubber is holding the pressure. That tyre comes off the car rather than gets monitored.
Big alloys and low-profile tyres look good and break easily. We check both when we come out to Hampton Court or wherever the car is standing: the tyre for cuts, splits and bulges, and the alloy for damage, before anything goes back on. On Palace Road, day or night, Weston Green included, arrival across Surrey runs 30 to 60 minutes. We are out on Palace Road at 2am and in West Molesey at 2pm.

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Molesey's driving does not wear tyres out so much as age them. Between short trips to Hampton Court and cars that sit for weeks in Kent Town and Molesey Hurst, most of the broken tyres we condemn here still carry plenty of tread. If you have found a lump, a crack or a cut, we will break the tyre down and show you what is underneath it.
A car in Weston Green had covered four thousand miles from new. The tread was almost untouched, the sidewalls were crazed the whole way round and the codes dated them to 2018. All four were replaced, which surprised the owner and was still the right answer.
A tight reverse into a space by the palace wall trapped the sidewall between the rim and the kerb edge. Nothing showed at the time. A fortnight later a bulge stood up in exactly that spot, which is the usual timeline for this kind of damage.
Something sharp on Molesey Hurst had opened a slit in the tread of a hatchback. With the tyre off the rim, steel was visible at the base of the cut. Water gets in there and the belts corrode, so it was scrapped rather than patched over.
It does. Rubber oxidises and hardens with time whether the car is driven or not, and wet grip falls away as it does so. The code moulded into the sidewall gives a week number followed by a year, so 3117 means the summer of 2017.
That the cords inside the casing have snapped, usually from a pothole or a kerb strike. The bulge is air pushing out against rubber on its own. There is no repair for it and no safe amount of further use, whatever the tread looks like.
Partly. Bulges, crazing and obvious cuts show from outside, but only the inside of the casing tells you whether a tyre has been run flat or whether a cut has reached the belts. It gets broken down off the rim before any verdict is given.
Less serious, but still worth watching. Fine crazing in the tread grooves usually points to age or ozone exposure. Cracks in the flexing part of the sidewall are the ones that end a tyre, because that is where all the movement happens.
More often, if anything. Standing does its own damage: flat spots, perished walls and corrosion where the tyre seals against the rim. A car used twice a month deserves a proper look at least twice a year, tread depth notwithstanding.
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