A split is not a cut and the difference is worth knowing. A cut is something sharp entering the rubber from outside. A split is the tyre coming apart under a load it could not take, usually where the wall was pinched hard against the rim by a pothole edge, and it typically runs in a line following the direction of the casing cords. Cuts are sometimes survivable depending on depth. Splits never are.
The lanes climbing out of this valley are exactly where they happen, because the surfaces up towards Northchurch and the hill roads either side of town break up over winter and the edges of the potholes are sharp and deep. A car dropping into one at speed pinches the tyre badly. So when we look at a suspect wall here the first thing we establish is which of the two it is, and if it is a split you are shown the line of it on the casing before anything else is discussed.
Big alloys and low-profile tyres look good and break easily. We check both when we come out to Gossoms End or wherever the car is standing: the tyre for cuts, splits and bulges, and the alloy for damage, before anything goes back on. Whether it is Northchurch in rush hour or the A41 at midnight, we answer. On the High Street, day or night, Sunnyside included, arrival across Hertfordshire runs 30 to 60 minutes.

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Berkhamsted sits along the floor of a Chiltern valley with the residential roads climbing steeply on both sides, and those hill roads and the lanes beyond them take a beating every winter. Pothole splits are the local speciality rather than a rare event. Establishing whether a mark is a shallow cut or a structural split takes the wheel off and a couple of minutes, and it decides whether you buy a tyre or keep the one you have.
A car that dropped into a bad edge on a lane above town had a wall split along the cord line. It was replaced on the spot.
A tyre scored against something on the A4251 High Street had a cut that stopped well short of the casing. It stayed in service.
A hard knock on a hill road near Castle Village damaged both the tyre and the rim edge, and both were assessed before fitting.
A cut is made by something sharp entering from outside. A split is the tyre tearing under load, usually pinched against the rim, and it follows the line of the cords.
No, never. The structure has failed along a line rather than at a point, and there is nothing to bond a patch to. It is one of the clear-cut answers.
Yes, over the next few days. Pinch damage sometimes takes a little while to show as a split or a bulge, and both walls are worth a look.
Yes. A pothole hard enough to split a tyre very often damages the rim edge as well, and a distorted rim will not hold a seal properly.
Typically 30 to 60 minutes, whether the car is on the High Street, up in Castle Village or stopped on the A41 bypass.
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