Damage one tyre and you expect to buy one tyre. Most of the time that is exactly what happens and we will say so. The question worth asking first is what sits on the other side of the same axle, because a damage swap quietly changes that pairing. If the survivor is a different make, a different tread pattern, or three winters further worn, the axle has stopped being a matched pair.
Braking balance is the whole of the argument. Two tyres on one axle share the work of stopping the front of a car, and they only share it evenly while they grip evenly. Put a fresh directional tread on one side and a hardened, half worn one on the other, and the new side does more while the tired side gives up sooner. At estate speeds you would hardly feel it. At the pace the H6 Childs Way carries traffic, you would.
You will get a straight driveable-or-not answer before anything else happens. A broken tyre is usually a slow discovery rather than a bang: a kerb strike, a pothole on a road like the M1, a cut picked up who knows where, a bulge spotted while it sat parked up in Bletchley. The A5 runs through it, Stony Stratford sits off it, and Newport Pagnell is the next call along. Level in Westcroft, sloping in Bletchley: we set the car straight first. Underground parking in Bletchley or Wolverton is worth flagging.

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Grid road driving is what makes this worth spelling out. Distances between Bletchley, Stony Stratford and the outer estates are long enough that most journeys settle at speed, and a mismatched front axle shows its hand under hard braking into a roundabout. We gauge both tyres on the damaged axle before anyone talks about money.
A cut sidewall in Wolverton meant one new tyre, and the tyre facing it across the axle had a few years on it. We fitted the replacement, then gauged the survivor properly. There was very little between them, so we left it alone and said why.
Two tyres can share a width, a profile, a load index and a speed rating and still behave nothing alike in the wet, because the compound and the belt package underneath differ. Where a damage swap leaves that split on one axle, we explain it and the driver chooses.
Most of these jobs end quietly. A kerb gash on a tyre with a near identical partner gets replaced alone, the rest of the set is gauged, and nothing further is sold. Telling somebody their other three have plenty left is not a missed opportunity.
No rule forces it and we will not invent one. What matters is how far apart the two tyres on that axle sit on tread depth, age and grip. Close together, fit the single one.
Put the better pair on the rear. A rear axle that lets go first is much harder to catch than a front one that pushes wide, whichever wheels drive the car. We can move wheels round while they are off.
That is where we look first on a kerbed wheel. The inner shoulder takes the load in a sideways hit and nobody inspects it. We steer the wheel over and run a hand round the shoulder and the bead.
It gets you off the road and that is all it was built for. The sticker on it gives the speed and distance it is rated for, and its rolling circumference is wrong against the other three. Use it, then replace it.
Usually. We stock premium, mid range and budget lines in the sizes cars, SUVs and 4x4s actually use, so a matching pattern is often already with us. Where it is not, we say what a different pattern on that axle means.
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