21" wheels?

i have a 96 taco that is body dropped 4"..i am going to put 21" wheels on it and was wondering if anyone knew the over all highth of a 21" with a 20 series tire? any help would be appreciated..thanks in advance

http://www.1010tires.com/TireSizeCalculator.asp this is a really good tire size calculator

the smallest tire i can find is a 245/25/21 and it is 25.82" over all diameter

Kumho are the only ones coming out with a 20 series, 375/20R21. They are meant for Viper and Hot Rod rears, so they won't even be close for a front end. And they aren't out until Jan 2008.

why not 22s they are same price, maybe even less?