RM500 Tire recommendations???

I want big, and agressive. Some dork had a 5.30-18 on the rear ( it's done) and it's time for a front too ( 100/80-21 I think)

ANyone recommend anything? I was thinking 5.60-18 or 140/80-18 .. I want it to hook up ( anyone got actual dimentions for either of those two sizes???)


Let me know your thougths