Grilled Country-Style Pork Ribs

2 tablespoons packed light brown sugar
2 tablespoons kosher salt
2 teaspoons ground ancho chili
2 teaspoons ground chipotle chili
1/2 teaspoon ground cumin
1/2 teaspoon garlic powder
1/2 teaspoon onion powder
3 1/2 pounds country-style pork ribs

-Combine all of the ingredients, except the ribs, in a small bowl & stir to mix
-Rub the spice mixture evenly on all sides of the ribs
-Place the ribs in a resealable plastic bag, or a plastic covered baking dish, & refrigerate for 8 hours or overnight
-Allow the ribs to come to room temperature (about 1 hour before cooking)
-Heat the grill to medium high heat
-Place the ribs on the grill with the larger/flatter side down, cover the grill, & cook until the pork is browned and crusty on the bottom (about 5-7 minutes)
-Flip, cover, & cook another 5-7 minutes
-Rotate the ribs, so that they are resting on the thinner side (you may need to prop them up against one another), cover, & cook until brown & crispy (about 4-6 minutes)
-Flip to the other thinner side, cover, & cook about another 4-6 minutes
*Ribs are done when all 4 sides are brown & crispy and an instant read thermometer inserted into the thickest rib registers 145 degrees F
-Remove from the grill & tent loosely with foil and let rest about 5 minutes before serving
Serves 4-6