Heat the oven to 300°F. Pat the ribs dry and place them meat-side up on a foil-lined baking sheet.
Mix the cinnamon, cayenne, paprika, garlic powder, and salt. Rub the mixture over both sides of the ribs.
Cover the ribs tightly with foil and bake for 1 hour 30 minutes, until the meat is tender and pulls back from the bones.
Whisk the maple syrup, vinegar, and Dijon mustard. Remove the foil and brush the ribs generously with the glaze.
Raise the oven to 425°F and bake uncovered for 10 to 15 minutes, brushing once more, until the glaze is glossy and bubbling.
Rest the ribs for 10 minutes, then cut between the bones and serve.