[JERSEYDEVIL]

lug patterns on that bug is 4x137mm on the rear, 4x110mm on the front.
you should have no problem finding rims that size. on the rears sometimes they will be listed on line as 4x136 but it's the same thing. Bear is right though you will need to make some changes if it's stock. you'll want to reclutch and coax as much power as possible if you want to move those bigger tires.
i recommend 15G rollers or 17g sliders yellow or even a red torgue spring in the clutch. yellow or sometimes white springs are referred to as med or 1500rpm springs. although the rpm rating isnt completely accurate. red would be the stiffer or 2000rpm spring.
adding a uni filter pod and getting rid of the stock airbox will help as well as a rejet and an exhaust to help the motor breathe. beyond that your into motor work.