In a small bowl, combine rice, vinegar, sugar, and salt. Set aside.
Place a square of plastic wrap over a sushi mat or on a clean work surface, place nori on top of plastic wrap. Using wet hands, spread rice over nori, leaving a 1-inch border on the end furthest from you. Set the crabmeat sticks across the center of the rice. Follow with the cucumber, lettuce, and avocado. Drizzle sriracha and mayonnaise over the avocado.
Using the plastic wrap, carefully roll the nori forward, pulling the ingredients inwards if necessary to ensure a tight roll. Cut in half, if desired. Serve with wasabi, pickled ginger slices, soy sauce, and sriracha, if desired.