What size tire should I use if I'm lowering my 95 accord on 18inch rims?

I have a 95 Honda accord I bought coilovers already but my accord has 18inch rims with some pretty big tires an I don't wanna rub l
What size tire should I go before I slap my coils on.

None, because "slap[ping] coils on," will surely destroy your oil pan and your V-TEC YO!

What's next, camber set to no man's land?