Spare Wheel/Tyre

@pingpongpete1 Have you actually put a tape measure round the spare and the car tyres to check the circumference or just sat the spare next to the wheel on the car?

Do you mean buying an identical spare to the size on the car, and not just a Full Size Spare.

Even if on a Steel wheel or alloy and the same circumference but narrower it is still just an Emergency Spare, as in a reduce your speed.

Take a wheel off the car and try it in the spare tyre well.

After all if you have to take a punctured or damaged wheel / tyre off it needs to go someplace if the boot was loaded up.