She said they are required to follow the law and meet any health and safety obligations.
The fatal crash was one of three crashes during the event, with two others seriously injured and another eight people also hurt.
PTA chairwoman Lynne Johnston said two other riders had to be airlifted due to remoteness with injuries; both of these were the result of single bike accidents.
Other injuries dealt with ranged from a broken collar bone through to a sprained wrist and cuts and grazes.
The track is 140km long and is designed to cater for a variety of riding levels with sections specifically for junior riders and others for experienced riders.