Thrashin' RC is a side mission in GTA: Liberty City Stories. It is a checkpoint race around Hepburn Heights, where you race an RC Bandit (in the form of a miniature Bobcat) against three others. To start this mission, you must enter a TOYZ van, which is parked at the construction site in Hepburn Heights. You must win the race to pass the mission.
Initially, the race only has one lap, but each time you win the race an extra lap is incremented. You can continue the RC races by entering the TOYZ van at any time.