Brad Keselowski promises to be a leader and push for a stronger NASCAR in his role as champion

Brad Keselowski was his brash and bold self as he navigated the grueling Champion's Week schedule in Las Vegas.

When it came time to be champion, he absolutely delivered.

Keselowski left little doubt how much he appreciates his new role as Sprint Cup champion, calling for unity and promising to be a leader in helping the series grow.

His remarks came as NASCAR is preparing to launch a new car aimed at addressing the slide in attendance and television ratings. And Keselowski drives for Roger Penske, so he's aware of the ongoing struggles in the IndyCar Series.

Keselowski said after his Friday night speech that he wants to be a part of the solution in strengthening American motorsports.