That raised ring of rubber around the outer sidewall, sitting just above where the tyre meets the rim, is there to be sacrificed. It is the rim protector, and its whole job is to hit the kerb so your alloy does not. Scuff it and usually all you have lost is rubber. What matters is the difference between a scuff and a split that runs along the rib in a line.
A split like that earns a proper look, because the rib sits directly over the part of the casing where the plies wrap around the bead. A kerb hit hard enough to open it up has also crushed the sidewall between the kerb and the rim, and that shows on the inside as two small bruises facing each other. From outside the tyre can look almost tidy. So the pressure comes out, the bead is broken and the inside gets read, and then you get a straight verdict: rubber gone but casing sound, or cords broken and the tyre finished.
Parallel parking damages more tyres than potholes do. Anywhere with tight kerbside bays, the B1040 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 Houghton or anywhere else in St Ives, balanced and pressure-set, with no tow and no garage booking. Whether it is Houghton in rush hour or the A1123 at midnight, we answer. On the A1096, day or night, Wyton included, arrival across Cambridgeshire runs 30 to 60 minutes.
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Kerb damage is the tyre problem St Ives specialises in. The old streets were never built for the width of a modern car, and the parking is tight enough that a wheel finds the kerb sooner or later. Most of what we get called to look at is skin deep. Some of it is not, and the only way to separate the two is to break the bead and look, which can happen wherever the car is parked.
Pulling in tight on the lanes towards Hemingford to let something through is how most of these happen. Nobody hits the kerb hard. You get squeezed onto it at an angle and the rib takes the damage.
The tight corners around Market Hill put a wheel into the kerb sideways rather than head on, and sideways is the direction the rib copes with worst. A line along the rib is the mark that leaves behind.
A sheet saying sidewall damage is not the same as a condemned tyre. We look at the same tyre, cut the question down to whether the casing is intact, and tell you which of the two you have.
Not on its own. A tester is looking for cuts deep enough to reach the cords, bulges, and tread under the limit. A rib rubbed shiny by kerbs is cosmetic. A split with a dark line at the bottom of it is not, and that is the one worth having looked at.
No, and anyone offering is doing you no favours. A sidewall bends thousands of times a mile, so nothing bonded to it stays bonded for long. Repairs belong to the central band of the tread, where the casing is stiff and backed by the steel belts.
Sometimes not, and then it comes off. Pressing either side of the split tells us a fair amount, and so does running a thumb along the bead seat. If any doubt is left after that, the bead gets broken, because guessing at this is worthless.
One tyre on its own is fine in most cases, provided the one across the axle from it has similar tread and the same rating. That gets checked before anything is fitted rather than afterwards, and we will say if a pair genuinely makes more sense.
If the casing is intact, yes, and there is no reason to spend anything. If it is not, the failure comes suddenly and it is normally the outer edge of the tyre that goes. That is not something to find out at seventy on the A14.
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