1. In a 4- to 6-quart slow cooker, toss together the beef, onion, garlic, chipotles, oregano, bay leaves, and 1 teaspoon salt.
2. Cover and cook until the beef is very tender, on low for 7 to 8 hours or on high for 3 ½ to 4 hours (this will shorten total cooking time).
3. Twenty minutes before serving, heat oven to 350° F. In a large bowl, toss together the cabbage, radishes, cilantro, lime juice, and ¼ teaspoon salt. Wrap the tortillas in foil and bake until warm, 5 to 10 minutes.
4. Transfer the beef to a medium bowl (reserve the cooking liquid) and shred, using 2 forks. Strain the cooking liquid through a fine-mesh sieve into the bowl with the beef and toss to combine.
5. Fill the tortillas with the beef and slaw. Serve with the sour cream, jalapeños, hot sauce, and lime wedges.
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