Prepare a medium-hot charcoal or gas grill fire. Combine the sour cream, chipotle, and 1/4 tsp. salt in a small bowl. Set aside at room temperature to let the flavors meld.In a small bowl, mix the olive oil, cumin, 1/2 tsp. salt, and 1/4 tsp. pepper. Rub this mixture on all sides of the steak. Grill the steak, covered, flipping once, until medium rare, 3 to 4 minutes per side. Transfer the steak to a large plate to rest for at least 5 minutes.
Meanwhile, warm the tortillas on the grill for about 30 seconds per side. Slice the steak across the grain into 1/4-inch-thick slices. Fill each tortilla with some of the steak, lettuce, tomato, avocado, and onion. Drizzle with the sauce and serve.
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