Enter your registration for the standard factory tyre fitment: size, load and speed rating, rim size, and the front and rear sizes where they differ.
✓Standard factory tyre size, front and rear
✓Load index and speed rating
✓Rim size and offset
✓Whether the car runs run-flat tyres
✓Recommended cold tyre pressures
✓Plus MOT history, tax, spec and valuation
A size like 235/60R18 breaks into three parts. The 235 is the tread width in millimetres, the 60 is the aspect ratio, meaning the sidewall height is sixty per cent of the width, and the 18 is the wheel diameter in inches. The letters and numbers after it are the load index and speed rating, which tell you the maximum weight and speed the tyre is built for. Fitting a lower rating than the manufacturer specified can invalidate your insurance.
Plenty of performance and rear wheel drive cars run a staggered setup with wider rear tyres, so buying four of the same size is a genuine mistake rather than a saving. Where your car came from the factory with different sizes front and rear, the report shows both separately.
The tyres on a used car are whatever the last owner fitted, which is not necessarily what the manufacturer specified. Aftermarket wheels, a cheap replacement in the wrong size, or a mismatched pair are all common. Knowing the factory fitment gives you the reference point, so you can tell whether what is on the car now is correct.
Enter your registration and the report returns the standard factory tyre size for your vehicle, with load and speed ratings and rim size, front and rear.
Small deviations are sometimes permissible but the load index and speed rating must meet or exceed the manufacturer's specification, and changing the rolling diameter affects your speedometer and can affect insurance. The factory size is the safe reference.
If your car has run-flats it likely has no spare wheel, so switching to conventional tyres leaves you without a way to continue after a puncture. The report tells you whether run-flats were the standard fitment.