Remove the ribs from packaging, and pat dry with a clean towel. Dust the ribs with the Barbecue Spice Mix until they are completely covered.
Fire up your smoker or pellet grill. Bring the temp to 225°F. Place the ribs in the smoker and smoke/cook, about 4-6 hours or until the tips of bones on the racks are exposed by about ¼ inch. The bones should be able to be pulled out of the rack easily.
Remove from smoker and rest for 10 minutes before cutting. Serve while hot.