In a bowl combine all of the rub ingredients together and mix well.
Place the two racks of ribs on aluminum foil. Coat the underside of the ribs with enough rub to cover them. Flip over and spread enough of the rib rub to cover the ribs.
Place the ribs on the grill meat side down over indirect heat and cook for 75 minutes. Flip over and brush the meat with half of the barbecue sauce. Close the lid and cook for another 15 minutes.
Remove the ribs from the grill and brush with the remaining barbecue sauce.