Rub garlic onto roast, then coat with flour. In a large Dutch oven, brown roast in oil. Add the tomato juice, carrots, onions, celery, bay leaves, salt, thyme and pepper; bring to a boil. Reduce heat; cover and simmer for 3-1/2 hours, turning meat occasionally.
Add potatoes; simmer for 30 minutes or until tender. Remove bay leaf. Remove roast and slice; serve with vegetables and gravy.