Combine peanut butter and yogurt, stirring until smooth. Drizzle juice over bananas; toss gently to coat.
Spread about 3 tablespoons peanut butter mixture over each tortilla, leaving a 1/2-inch border. Arrange about 1/3 cup banana slices in a single layer over peanut butter mixture. Combine wheat germ and cinnamon; sprinkle evenly over banana slices. Roll up. Slice each roll into 6 pieces.