HEAT oven to 350ºF.
COMBINE sugar and seasonings; rub onto both sides of ribs. Place in foil-lined 13x9-inch pan.
BAKE 1 hour.
HEAT grill to medium heat. Remove ribs from pan. Grill 15 min., turning after 8 min. Brush with 1/2 cup barbecue sauce. Grill 5 min.
SERVE ribs with remaining sauce.