LeBron James -- Bangs Out Car Commercial ... In Middle of NYC Street

It was like a surgical strike ... LeBron James dropped in to the set of a car commercial in the middle of a busy NYC street -- NAILED his part -- and peaced out like a pro ... and TMZ Sports got the whole thing on video.

When 'Bron got to the set of the Kia spot, the car was already set up ... the crew was ready to go ... and James knew his part.

Two takes later, the director was happy ... LeBron bolted from the set ... and was off to the next big NBA All-Star Weekend event.