This figure of 8 shaped route is tougher than it looks on the map. The initial climb takes you up nearly 400m! From here on, though, its downhill all the way to the halfway point of Pontsticill village. The route should only be undertaken in clear weather as this section is rather featureless and navigation can be difficult. After Pontsticill you choose between the Taff Trail forest route, or a cruise on the road alongside Pontsticill Reservoir. Now its time to go off-road and up again back to the crossing of the figure of 8. Now its down again all the way to the Usk Valley and a few kilometres on the road back to Talybont.
More information can be found here: http://www.mtbbreconbeacons.co.uk/english_pages/hubs.htm