Highlight • Other
St Cynog's Church, Defynnog
Mountain biking
5.0
(8)
Cycling
5.0
(1)
Hiking
5.0
(1)
Road cycling
5.0
(1)
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Tips
October 15, 2018
Mountain biking
July 26, 2026
Hiking
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Nearby routes
Best routes near St Cynog's Church, Defynnog
3.7
(9)
31
riders
32.0km
02:41
640m
640m
Embark on the Sarn Helen and Twyn y Gaer loop for a challenging mountain biking adventure through the Brecon Beacons National Park. This moderate 19.9-mile (32.0 km) route, which you can complete in about 2 hours and 40 minutes, features a significant 2086 feet (636 metres) of elevation gain. You will start from the village of Heol Senni, climbing alongside a river through twisted trees, encountering two sharp hairpins before reaching a brow with expansive views. The trail offers a mix of roads, paths, and technical singletrack, promising fast and frenetic riding. From the summit of Twyn y Gaer, you can enjoy 360-degree panoramic views of the Brecon Beacons and Black Mountains, including Pen-y-Fan, Corn Du, the River Usk, and surrounding farmland.
When planning your visit, be aware that the paths leading to Twyn y Gaer can become boggy, especially after wet weather. The exposure to the elements can also increase the challenge, so check the forecast before you go. This loop requires good fitness and advanced riding skills due to its significant climbs and technical sections. Starting your ride from Heol Senni provides direct access to the varied terrain, which includes tarmac, gravel tracks, and singletrack.
This route integrates sections of the ancient Sarn Helen, a historic Roman road system, allowing you to ride through a landscape rich in history. Twyn y Gaer itself is the site of an Iron Age hillfort, adding another layer of historical interest to your ride. The Sarn Helen and Twyn y Gaer loop is part of a larger network considered one of Britain's most ambitious off-road rides, making it a rewarding experience for mountain bikers seeking a challenging adventure with breathtaking natural and historical scenery.
8
riders
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
Details
Informations
Elevation 220 m
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Thursday 27 August
18°C
13°C
80 %
Additional weather tips
Max wind speed: 24.0 km/h
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