Kellen Winslow Jr.

Kellen Winslow Jr.'s NFL career might be over, but he's decided to channel his competitive drive and focus on DOMINATING a whole new sport ... cycling. The former Pro Bowl tight end -- who played 10 seasons in the NFL -- has been training like a maniac ... already dropping from 245 to 215 lbs so…

8:41 AM PT -- Kellen's rep issued a statement saying the whole thing was a misunderstanding because Kellen was NOT throwing a J. "Kellen pulled over to a parking lot to smoke what he thought at the time was a legal substance. He changed his clothes in his vehicle as to not smell like smoke when he…