There is a kind of tyre damage that keeps getting mistaken for wear. Rather than the tread going down evenly, whole blocks lose their corners and tear away, leaving ragged notches along the outer edge while the middle of the tyre still looks healthy. Fitters call it chunking. It turns up on cars living on a mixture of fast dual carriageway and rough estate roads, and on 4x4s wearing aggressive all terrain patterns that spend their whole week on tarmac.
It is not wear. It is the block being ripped off, and the causes are worth knowing: running underinflated so the shoulder squirms and heats up, hard braking on hot coarse surfaces, kerbing, and soft compounds that were never intended for this. Whether the tyre is finished depends on how deep it goes. Surface tearing on the outer blocks, with the grooves still deep and no cord in sight, is often a tyre you can keep, provided somebody sorts out the cause. A chunk down to the belt, or any wire winking back at you, is scrap and there is no argument to have about it.
Parallel parking damages more tyres than potholes do. Anywhere with tight kerbside bays, the A428 included, produces a steady supply of scuffed sidewalls. If it has gone too far, we bring the right size and fit it where the car is parked, in Loves Farm or anywhere else in St Neots, balanced and pressure-set, with no tow and no garage booking. The B1428, the A1 and the streets around Little End Road sit inside Cambridgeshire. Eaton Socon side streets, Eaton Ford drives, the bays on the A1: room enough for us. Level in Loves Farm, sloping in Wintringham: we set the car straight first.

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Between the estate roads at Loves Farm and Wintringham, the older streets around Eynesbury, and the fast miles most people here rack up towards Huntingdon or St Ives, tyres in this town lead a mixed life and it shows first at the edges. We come and look at the damage where the car is parked and give you a straight verdict, and quite often that verdict is that you should keep your money.
A 4x4 on chunky blocks that had started tearing at the shoulders after a winter of commuting. Three quarters of the depth was still sitting there. We measured it, explained the pattern, and sold him nothing.
That is almost never the tyre's fault. This one had been running well under pressure for months on a leak nobody had chased, and the shoulder had torn itself to pieces while the other three were perfect.
The older turnings around Eynesbury are parked solid and leave very little room, and a wheel scrubbed hard along a kerb face tears the outer blocks as well as marking the wall. We look at the rim too, because both take the hit.
Heat and flex at the edge of the block, nearly always. Low pressure, a soft compound, hard cornering on hot tarmac, or geometry dragging the tyre slightly sideways. Sort that out and the next set behaves itself.
It is once the structure shows through, or once the tread in the central three quarters drops under 1.6mm. Before that it becomes a judgement call, and our job is to give you an honest one instead of a sales pitch.
If the cause is still sitting there, yes. That is why we look at the pressures, at how the wear sits across the width, and at the other three wheels before recommending anything at all.
No, we fit tyres. But the way a tyre has torn tells you plenty, and if the pattern points at the geometry we will say so plainly, so you can get it checked before the new one wears out the same way.
Then it is fine, and you have not spent anything on rubber. That happens more often than you might think. We would sooner be the people who told you the truth than the people who sold you a pair you did not need.
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