Ford wire wheel

[lilorbie]

I was at a local antique store the other day. And they had wire wheel. It has the five on five and a half bolt pattern and it measures from outside of the rim to the other side 18 1/2 inches. I have four other wire rims that measure 17 1/2 inches. What does my new to me rim fit and what size of tire do I need to get for it.? It's only going to be used as a spare. Thanks for any help with this.