Remove silver skin from bone side. Pat dry. Rub with yellow mustard.
Apply BBQ rub, then B rub, then SPG mix. Let rest 30–45 minutes.
Heat smoker to 250°F. Use hickory, oak, or mesquite wood.
Place ribs bone-side down. Smoke and spritz every 45–60 minutes.
Optional: Wrap in butcher paper or foil after 3–4 hours if desired. Cook until internal temp reaches 200–203°F.
Rest ribs wrapped in foil for 30 minutes.
Slice between the bones and enjoy!