Bring a large pot of salted water to a boil and cook rotini pasta according to package instructions until al dente.
Drain the pasta and rinse immediately under cold running water until completely cooled; drain thoroughly to remove excess moisture.
In a large mixing bowl, whisk together the ranch dressing and mayonnaise until well combined.
Add the cooled pasta, cherry tomatoes, peas, cheddar cheese, crumbled bacon, red onion, and black olives to the bowl.
Fold the ingredients together gently until the pasta and vegetables are evenly coated in the dressing.
Season with black pepper and cover the bowl with plastic wrap.
Refrigerate for at least 30 minutes before serving to allow the flavors to meld and the salad to reach optimal serving temperature.