Not everything stuck in a tread is a puncture. Cars parked on gravel, unmade drives or the edges of lanes pick up small stones constantly, and those stones wedge into the grooves and stay there. Most are entirely harmless: they sit in the groove, do nothing at all, and eventually fall out. A few are not, and telling the two apart matters, because the harmless ones can safely be left and the others should be dealt with before they work through.
The rule of thumb is about shape and position. A rounded pebble sitting in the bottom of a groove is doing no damage. Anything sharp, anything wedged between tread blocks so it is being levered as the tyre flexes, or anything that has started to sink into the rubber rather than sitting on it, is worth having removed properly. On the lanes around Hertford and the drives in Bengeo and Sele Farm that is a regular find. We check the whole tread at the car and remove what needs removing, with the tyre off the rim where anything looks like it has penetrated.
The first job is not the repair, it is the verdict. That work happens where the car is, on the A414 or on a driveway in Foxholes, with the wheel off, the tyre inspected from the inside and a proper plug-patch fitted rather than a can of foam. The wheel comes off in Sele Farm, not on a ramp in Stevenage. Nothing is towed out of Foxholes or Hartham; the work finishes there.
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Hertford is a compact town surrounded by lanes, with plenty of unmade parking and gravel drives around Bengeo and Sele Farm, so grit in the tread is an everyday thing here rather than an alarm. Knowing which pieces matter saves both unnecessary worry and the occasional expensive surprise. Since we come to the car, having all four looked over costs nothing extra.
A car parked on an unmade drive near Foxholes had grit all through the grooves and not one of them had done anything. Cleared out and nothing else needed.
A vehicle in Hertford Heath had an angular chip that had started to bed into the rubber. Left alone it would have worked through within a few months.
A driver near Hartham had a stone jammed between two tread blocks. Every revolution was working it, and the block edges had begun to tear.
Rounded stones sitting in a groove are harmless and usually fall out on their own. Anything sharp, wedged between blocks, or sinking into the rubber is worth having looked at instead of prised out.
It can, if it is sharp and gets driven in over time. Most do not, which is why the useful skill is telling the two apart rather than removing everything.
Then it needs the tyre off the rim so it can be removed under control and the injury measured. Pulling it out in the road usually turns a slow leak into a flat.
Yes, the whole tread on all four. It takes a couple of minutes and it regularly catches something before it becomes a problem.
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