Start rice according to package directions; brush steak and peppers with oil, season with salt and pepper, and grill steak over high heat 4 minutes per side, then set aside to rest.
Grill peppers cut-side down until charred, about 6 minutes total, then slice into strips.
Juice one lime, chop cilantro, and stir into cooked rice with lime juice and salt to taste.
Slice steak against the grain, plate with peppers and cilantro-lime rice, and serve with lime wedges.