Rodney Mullen -- Freestyling Again ... After Filing For Divorce

Skating pioneer Rodney Mullen is about to put his focus back on freestyling ... the "Godfather of Street Skating" has filed for divorce from his wife of 13 years.

Rodney and Traci Mullen were married in April of 2000, and have no kids. They signed a prenup a month before the wedding according to divorce docs ... and Rodney wants it enforced -- in particular, the section that frees him from paying spousal support.

Rodney cites irreconcilable differences for the split.

If you've seen kids doing tricks involving kicking and flipping their boards around on the street or at the skatepark, you've seen Mullen's influence -- he either invented them or had them improved upon during his '80s heyday.