Mountain Biking:Llyn Brianne & The Devil's Staircase at Llanwrtyd Wellsadd to shortlist

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Abergwesyn Valley

Abergwesyn Valley

Image Credit: Crown Copyright
Abergwesyn Valley

Mountain Biking




1. (00km) Start at the square in Llanwrtyd Wells with your back to the Neuadd Arms Hotel and TURN R towards Abergwesyn. In Abergwesyn 8.3km (5.2m) TURN L and follow the old drovers road over the cattle grid and up the steep sided Abergwesyn valley. The road drops to cross the River Irfon (over what are locally called The Irish Bridges because, when the river is in spate, the water covers the bridges!) and then up the fearsome Devil's Staircase with a gradient of 1:4. Thankfully, climbing stops after about 1km (0.6m), the road levels out before plunging down an equally steep gradient to the next junction.

2. (15.3km / (9.5m) TURN L (signposted RHANDIR-MWYN) and follow this road. Stay on this fairly level road along the side of the valley of the River Towy then around the Llyn Brianne (there are many view points and various picnic sites) reservoir. It becomes more hilly to the south.

Llyn Brianne is a spectacular reservoir at almost 300m (990ft) above sea level. It holds over 64million cubic metres of water contained by a 91m (300ft) stone-built dam and is the largest of its kind in Europe. To visit the dam TURN R after a short descent and a cattle grid at about 29km (18m).

Carry on past Dinas Hill which is an RSPB nature reserve and a good place to spot Red Kites. Stay on this road, keeping L into Rhandir-mwyn 36km (23.4m) then KEEP SO past the pub for about 2km (1.2m) to a T-junction.

3. (38.2km/23.7m) TURN L and follow the steep road towards Llanerchindda. In Llanerchindda you descend a VERY STEEP road with hairpin bends and on down the valley of the Afon Bran, under the spectacular viaduct carrying the Heart of Wales Railway. Just after Cynghordy Hall TURN L 44.5km (27.7m) to join the usually busy A483.

4. (45km/28m) NOTE: you can TURN L and follow the A483 back to Llanwrtyd Wells which is 10km (6.2m). Far better though to finish this epic ride on quiet, undulating roads. TURN R and follow the A483 for about 0.5km (0.3m) and TURN L up the hill all the way to Tirabad 53km (33m). KEEP L in Tirabad and follow this rolling road to Cefn Gorwydd x-roads 58.5km (36.4m) then TURN SHARP L and follow this road back to start.





Location and nearby places


Plan route to Llanwrtyd Wells using Google mapsPlan route using Google maps

Map reference: SN 878467  Lat: 52.10730 Long: -3.63870


Llanwrtyd Wells is located on the main A483 road between Builth Wells and Llandovery. There is on-street parking available in the town.

The train station is approximately a 10 minute walk from the town along a paved walkway.

Parking: free

Accessible by Public Transport: 1 mile from Llanwrtyd station

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