Riki Rachtman files for divorce from wife Gayle

90s MTV host Riki Rachtman -- one of the most recognizable faces from Headbangers Ball -- has filed for divorce, TMZ has learned.

Riki -- who also hosted "Rock of Love" on VH1 -- filed the docs against Gayle Rachtman in L.A., citing irreconcilable differences. According to the docs, they were married in 2003 and separated in 2011. They have no minor children.

And how's this for a change ... in the docs Riki says he wants the court to grant Gayle spousal support -- though the amount is not specified.