Street tires for a KDX200 93

[bigboyeatburgers]

does anyone have any advice on a street tire for the stock rims on a kdx200? its a titled KDX and i am going to have two sets of rims, one for dirt another for Supermoto! I didnt know if i should go for "bigger is better" I was thinking i should go for the biggest tire on fron and back does anyone have any objection to this or advice? help with dimensions would be great along with brand names w/ models. I have a normal 18 and 21 inch setup

thank you
Zack