The BikeSA Grand Slam Challenge Series is South Australia's premier progressive-distance road cycling series, structured to build stamina and confidence across five fully supported rides throughout the year. Each event is longer than the last. They start at 40km in February and culminate in a 100km or 200km Grand Finale in October. Riders choose the Grand Slam (full distance) or Mini Slam (shorter loop) at each event. The series is open-road and non-competitive, with clear route markings, hydration stations, catered rest stops, first aid, and mechanical backup. Organised by Bicycle SA, it is among the best-value supported cycling series in the country.