Place the beans in basket insert of pot. Submerge basket with beans into boiling salted water and cook uncovered, stirring once or twice, until crisp-tender, about 6 minutes. Drain, transfer beans to bowl of ice water to cool. Drain and pat dry.

Return water in pot to a boil. Add the pasta to the basket insert and cook until pasta is tender but still firm to bite, stirring occasionally, about 12 minutes. Drain. Rinse well under cold water; drain again.

Cook bacon in a large skillet over medium-high heat until crisp but not brittle, about 8 minutes. Transfer bacon to paper towels to drain. Coarsely chop the bacon.

Whisk ranch dressing, vinegar and pepper in large bowl. Add the beans, pasta, bacon and tomatoes; toss well. Season with salt and pepper. Serve within an hour or so of assembly.