Those up for the challenge can choose between timed mountain trail biking routes of 25km or 40km. The specially designed courses use bridleways, off-road tracks and exclusive trails on private land, which will be available for this day only, making it a unique way to experience biking through the area.
The event is one in a series being held to raise money for a range of important improvements to the school.
Under-16 riders are welcome with an accompanying adult.
Visit www.deanbarwick.cumbria.sch.uk for further details and to enter.