The Morialta Special Grand Loop is a Strava Segment in Woodforde, South Australia, and the Challenge runs from Monday, 1 January to Saturday, 3 March 2018.
You can attempt the Challenge as many times as you want between these dates. At the end of the Challenge, the top 12 on the Strava leaderboard during the time period will be invited to compete in a single event for the chance of pocketing a $250 cash prize. There's also $100 up for grabs for setting the male and female fastest time during the Challenge period.
The live final event for the 12 athletes will be March or April, on a date that suits all entrants.