public class RacingMountainBike extends MountainBike {
  
  int racingNumber;
  
  public RacingMountainBike(int startHeight, int startCadence,
                        int startSpeed, int startGear, int num) {
    super(startHeight, startCadence, startSpeed, startGear);
    racingNumber = num;
  }
  
  public String toString() {
    return super.toString() + ", racing number: "+ racingNumber;
  }
  
}