Tyres work in pairs whether you think of them that way or not. The two on an axle share the braking and the grip between them, and they only share it evenly if they are broadly alike. Put a fresh tyre with 8mm of tread against one worn down to 2mm on the same axle and the car pulls under hard braking, because one side bites and the other lets go a fraction earlier. On a wet road that fraction is where the trouble lives.
That does not mean an emergency job automatically becomes two tyres. Most of the time one goes on and the pair is close enough that nothing changes. But if the survivor is nearly finished, you deserve to be told, and told before the wheel comes off rather than after the invoice. The other point worth knowing is that the newer pair belongs on the rear, whichever end drives the car, because a car that loses grip at the back first is far harder to catch.
The gap between "needs replacing" and "needs replacing now" is usually a journey you cannot move. A run on the M25 near junction 11 on a tyre that is already down to the markers is not a risk worth taking. Old tyres leave Hersham, Ashley Park and Surrey with us, every time. You watch it happen in Oatlands, or at the kerb in Lower Green.

Emergency tyre replacement in Walton-on-Thames is part of our wider 24-hour emergency callout across London and the home counties cover. For emergency tyre replacement in Walton-on-Thames, call 07717 389637 or send us your details for a price.
Plenty of the urgent replacements we do in Walton follow a pothole on the A317 or a kerb on one of the tighter streets around Lower Green. While the wheel is off it costs nothing to measure the other three, so a tyre that was going to strand you next month gets flagged now instead of becoming a second callout.
Fitting a single new tyre here technically gets you moving and genuinely makes the axle uneven. We will fit the one, tell you what the other has left in it, and let you make that call rather than making it for you.
Common and worth questioning. Whichever wheels drive the car, the better tread belongs behind you, because grip lost at the rear turns into a spin rather than a slide. Swapping them round while we are there costs nothing.
Sustained speed is where a mismatched axle stops being theoretical. If the car is going out to Junction 11 and onto the motorway, the pair matters more than it does on the run into Walton Town.
No. The law is about the condition of each individual tyre. Pairing is about how the car behaves under braking, which is a separate and quite practical argument.
As a rule of thumb, a couple of millimetres of tread depth across an axle is fine and a large gap is not. We measure both and tell you the actual numbers rather than an impression.
Yes, provided the size is aboard, which for common car, SUV and 4x4 fitments it usually is. Give us the code off the sidewall when you ring and we will confirm before setting off.
On the rear, as a rule, regardless of which end drives. It is counterintuitive and it is the right answer for stability in the wet.
Where we can, and we will tell you when we cannot. Matching the pair matters more than matching all four, and the specification matters more than the badge.
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