Fibber Mountain is a summit of 302m which you can get to by following various trails. Be sure to check the trail map, as they vary from double track and fire roads to difficult singletrack. To get to the top of Fibber Mountain, you will follow the rollercoaster trail which is a technical singletrack route, so better suited to confident riders or people on a mtb.
This is an exciting area with relatively new trails, a lot of which pass through the old Shelden estate.
Note that the trails will be closed during heavy rain events.