21/20 tires on 300ex

is any one runing this setup? 21 inch tires on the front and 20 inch in the back. i am thinking about running this set up and i was wondering if any one else has it and if you do how do you like it? I am thinking about geting razrs all the way around and on the rear 10" red labels. i will get 4 ply because i dont realy need 6 because i dont ride in rocks and just on the trails and i have never goten a flat yet.
if you have 21" front tires and 20" rear tires post a pic of them on the quad please.
thanks.