that is to vague for any of us to answer. what kinda car is it? are they factory wheels/tires? help us out
All tyres have their size written on the sidewall. If yours doesn't then something is very wrong and I don't think they are road legal tyres. The tyre size will be a series of numbers such as (for example) 185/65 R14, plus another series of letters for the speed and load ratings and other information. 185 is the section width (how wide the tyre carcase is, not the tread width), 65 is the aspect ratio (how tall the tyre is as a percentage of the width) and R14 is for a 14" wheel rim.
10 in a half shoe