NFL's Sheldon Richardson -- Pleads Not Guilty In Alleged Bentley Chase

Sheldon Richardson's digging in his cleats ... pleading NOT GUILTY to resisting arrest stemming from an incident where he allegedly led cops on a high speed chase in his Bentley.

Cops say the NY Jets defensive lineman was clocked at 143 MPH and blew through a red light while racing another car in St. Louis on July 14th ... with a 12-year-old child in the backseat of his ride ... with a gun in the car.

Richardson -- who's currently suspended from the Jets for a failed drug test -- was ultimately charged with resisting arrest, failure to have license plate lights, excessive speeding, running a red light and following too closely. He pled not guilty to everything.