NASCAR pit crews are key to a driver 's success . But the seconds spent during a pit stop -- changing tires and refueling the car -- may be the most crucial moments of any race . Crews have to make the stop inside 30 seconds . Head coach of the 48 car crew at Hendrick Motorsports explains the importance of pit crew .
NASCAR pit crews are key to a driver 's success . Crews have to make the stop inside 30 seconds . Head coach of the 48 car crew at Hendrick Motorsports explains the importance of pit crew .