Tire size Scamp - Duster Once again

OK I'm considering 15 X 7 wheels with a 4" backspace on a SCAMP BBP with disc brakes manual steering.I know there are several postings about this but I do not want to look at all of them.What would be a GOOD tire size for the front.----------------------------Thanks
AGAIN DUSTER OR SCAMP FRONT ONLY NO DARTS