Cook pasta according to package instructions. Drain and rinse under cold water.
In a large bowl, whisk together balsamic, olive oil, salt, and pepper to make the dressing.
Add cooked pasta, diced bell pepper, diced cucumber, chopped red onion, sliced black olives, and crumbled feta cheese to the bowl with the dressing. Toss until well combined.
Chill the pasta salad in the refrigerator for at least 30 minutes before serving, allowing the flavors to meld. Serve cold.