Retired NFL superstar Chris Johnson says he's still so fast ... he could beat Baltimore Ravens QB Lamar Jackson in a race TODAY!!!
The former Tennessee Titans running back told the guys on "TMZ Sports" (airing weeknights on FS1) he has zero doubts about it too ... saying, "Yeah, I beat him right now."
It's a WILD statement from the 34-year-old ... considering nobody has been able to catch up to Lamar at all this season (the guy has 1,206 rushing yards on just 176 carries).
But, Johnson swears he's still got wheels .