A 225/40 R18 has roughly 90mm of sidewall between the rim and the road. The 65 profile it replaced on the same sort of car had nearer 130mm. That missing 40mm is the whole story of modern wheel damage: there is no longer enough air and rubber to swallow a pothole or a broken verge edge, so the rim goes down onto the object and pinches the casing against its own flange. What comes of that is a split you can get a fingernail into, usually on the inner sidewall where nobody looks.
None of it can be repaired. A sidewall carries the load and bends on every revolution, so there is nothing for a patch to hold onto, and a fitter who offers to try is not one to use twice. The honest answer is a new tyre, and the only real questions are how quickly and how well. The van holds the sizes that fit most cars, SUVs and 4x4s round here, from value tyres up to the premium names, and whatever goes on is balanced and tightened to the manufacturer's own figure rather than to how hard an air gun feels.
Give us the full sidewall code and the answer comes back quickly. Width, profile, rim size, then the load index and the speed rating, something like 225/45 R17 94W. The letters at the end are not optional extras; they are what the car was designed around. The wheel comes off in Station Road, not on a ramp in Burwell. Nothing is towed out of Mereside or Fountain Lane; the work finishes there.

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Low profile wheels and open country roads are a poor mix. The verges along the B1102 and B1104 crumble where traffic drops off the edge. Add the weight the A142 carries, which opens up the tarmac at the joints, and rims here take hits that older, taller tyres would have absorbed. Once a rim has cut a sidewall there is no repair and no getting to a workshop on it, so we come to where the car stopped.
Verges break up where heavy traffic drops a wheel off the tarmac, and on a low profile tyre that edge reaches the rim. Once the sidewall has split there is nothing to discuss: it needs replacing where it stands.
Inner sidewall damage hides from anyone walking round the car, and it is often found only when the tyre finally goes down overnight. By then the car is going nowhere without a replacement.
A car needed at six with a ruined tyre and no usable spare is not a booking, it is a problem to solve that night. A replacement fitted on the drive means the morning happens as planned.
Not always. Where the other one still has plenty of tread and is the same make and pattern, one will do. If the survivor is well worn or a different tyre altogether, matching the pair keeps grip even across the axle, and on a four wheel drive that matters more than on anything else.
Usually. Read us the full size and the make off the sidewall when you call and we will bring the same again where we can, or the nearest sensible equivalent, and you will hear which before the old one comes off.
Then you are told on the phone rather than after we have turned up and shrugged. Odd sizes get sourced quickly and brought out to you, and you know the timing before committing to anything.
Rarely. You are buying somebody else's wear with no history of how it was run, and the checks on part worn stock are easy to fudge. A budget new tyre in the correct size is usually the better buy, and it carries a two year warranty.
With a torque wrench, to the figure for your car, working across the studs in sequence. That is what keeps a wheel from loosening and what keeps a brake disc from being warped by uneven clamping.
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