Bring a large pot of salted water to a boil. Add the rotini pasta and cook according to package instructions, typically 7-9 minutes, until al dente. Drain and rinse under cold water.

While the pasta is cooling, finely dice the celery ribs and bell pepper.

Chop the imitation crab into bite-sized pieces.

In a large mixing bowl, combine the cooled rotini pasta, chopped imitation crab, diced celery, and bell pepper. Gently fold together.

Add the light mayonnaise and stir gently until well-coated. Taste for seasoning and adjust if needed.

Cover the bowl with plastic wrap and chill in the refrigerator for at least 30 minutes before serving.