It gave those taking part a chance to ride the public trail around the top of the quarry as well as a specially set up descent to the bottom with various zigzags, jumps, ramps, drop-offs slopes, pipes and a log section.
Money was raised for the The Smile For Georgie Foundation.
The event was organised by quarry manager Seasmus Gillespie with help from the Guernsey Mountain Bike Association and Geomarine.
Video and pictures by Judge Drone.