I have a Phil, it's 15t. got it at Montano Velo, I don't know if they come any smaller though.
By the way, Phil Wood Co gave us a couple to give away as prizes in the Oakand Scrape. one's a 1/8" 17t and the other is 3/32" 18t.
they're totally shiny and chrome looking, and no one is going to look at your cog.