In a small bowl, whisk together chile powder, cayenne pepper, parsley, lime zest, and lime juice until thoroughly combined.
Lightly oil the corn and rub on the combined ingredients from the bowl. place the ears on aluminum foiled pan BBQ safe.
Preheat for 5 minutes. Place the pan with corn on the grill and cook until tender and slightly charred, about 20 minutes, turning often during cooking.
Remove from the grill and let cool for 3 to 5 minutes. Serve with the lime wedges.