Preheat the oven to 350°. In a small bowl, mix the pepper with the sugar, salt and smoked paprika. Sprinkle both sides of the ribs with the pepper mixture. Place the ribs, meaty side up, on a large rimmed baking sheet. Bake for 2 1/2 hours, or until the meat begins to pull away from the bones. Transfer the ribs to a cutting board and let stand for 5 minutes. Cut the racks into individual ribs and serve.