Is there any particular reason you want to know this?

Unless you are aiming for a particular look, I'd probably suggest looking more into tyre brands and models than sizes. Putting oversized tyres on small wheels won't help you as much as putting the correct size tyres that are of a good quality. In fact, the further you stray from the correct size, the more chance there is of something going wrong, especially with a wheel as small as 14". With such a large side-wall, the potential for flex is immense. It'll suck for handling, since the side-g's are virtually ripping the tyres right off the wheels.