Smallest 22 inch tire?

What is the smallest 22 inch tire? and what is the over all hight of it? as compared to a 20 inch tire?

I found a 235/30/22 yesterday, Nitto Neo Gen. $287 per from Discount Tire. 27.55 inches tall WWW.tires.com

I heard there is a 25 series out there

straight from nitto's website

http://www.nittotire.com/tires_neogen.asp

click on sizes and specs and its listed at the bottom

235-30-22 = 27.76