In a small bowl mix the rub spices and brown sugar.
Soak the wood chips in water for at least 30 minutes.
Clean the ribs up by removing the back membrane, salt and pepper both sides and spread the rub spice mixture over the top of the ribs. Let stand at least 30 minutes at room temperature, but I prefer to wrap in plastic wrap and foil and place in the refrigerator overnight to marinate.
Preheat the grill to 350°F.
Brush the cooking grates clean with a wire brush. Add one handful of the wood chips to the smoker box of your gas grill and close the lid. When the wood begins to smoke, put the rib(s) bone side down, and close the lid.
Drop the temperature of the grill down to 250°F. Cook until the meat has shrunk back from the bones at least ½ inch and the internal meat temperature is 196°F, about 1 hour and 20 minutes. Keep the temperature of the grill at 250°F.
Remove the racks from the grill and let rest for 10 minutes. Cut the racks into individual ribs and serve warm.