Heat oven to 375 degrees.
In a small bowl, combine the chipotle pepper, paprika, cumin, coriander, 1 tablespoon of the oil, and 1 teaspoon salt.
Place the pork on a rimmed baking sheet and coat with the spice mixture.
Roast until the internal temperature of the pork registers 145 degrees, 40 to 50 minutes.
Let rest for at least 5 minutes before slicing.
Meanwhile, in a medium bowl, toss together the beans, avocado, cilantro, scallions, chili pepper, lime juice, the remaining 3 tablespoons of oil, and ½ teaspoon salt.
Let stand while the pork roasts.
Serve the pork with the bean salad and lime wedges.
