In a small bowl combine the cumin, coriander, garlic powder, salt, pepper, paprika, chili powder, cayenne pepper, and lime zest. Mix well to combine.
Thirty minutes before grilling the steaks remove them from the refrigerator and rub them on both sides with the southwestern rub.
Meanwhile, place the corn in a gallon sized zip top bag along with the olive oil, salt, and pepper. Allow to sit in the olive oil for 30 minutes.
In a small bowl combine the mayonnaise, sour cream, cheese, chili powder, and garlic powder. Mix well then place in a shallow pan.
Heat a gas grill to medium high heat.
Remove the corn from the olive oil and place on the grill. Cook for 8-10 minutes, turning frequently, until the corn starts to get brown. Remove from the grill and immediately roll in the sour cream mixture. Sprinkle with cilantro, extra Cotija cheese, and extra chili powder. Serve with a lime wedge.
As soon as you put the corn on the grill get the ribeyes on the grill as well. Cook for 5-6 minutes per side or until the internal temperature reaches 130 degrees. Remove from grill and serve with Mexican Street Corn.