This is very long for a green route, taking you just outside of the National Park onto country lanes and farm tracks. The route briefly follows the busy A470 but for most the route you pass through old Breconshire hamlets and villages. There are two off-road sections, the first being quite flat, and second being mostly downhill.
More information can be found here: http://www.mtbbreconbeacons.co.uk/english_pages/hubs.htm