When my wife (yes - honestly) bought her car it didn't have a spare wheel (no I didn't think to check!).
Now apparently we need one for this coming weekend.
Do I just need the tyre size or is there some other measurement that I should have in order to not look like a dick when I try and buy one?
If it is important the car is a Ford Focus Cmax (diesel), tyres are 205/55/R16.
Thanks
Matt

