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Mountain biking trails

Sarn Helen and Twyn y Gaer loop — The Brecon Beacons National Park

Routes

Mountain biking trails

Sarn Helen and Twyn y Gaer loop — The Brecon Beacons National Park

Moderate

3.8

(6)

riders

Sarn Helen and Twyn y Gaer loop — The Brecon Beacons National Park

02:41

32.0km

640m

Mountain biking

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…

Last updated: April 23, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Brecon Beacons National Park

Waypoints

Start point

Parking

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326 m

St Cynog's Church, Defynnog

Highlight • Other

Although Defynnog lost local prominence as the nearby Sennybridge became more developed, the church boasts some extraordinary features. It contains a stone with ancient Ogham inscriptions (an ancient British Alphabet) …

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10.4 km

Devil's Elbow Climb from Heol Senni

Highlight (Segment) • Viewpoint

The Devil’s Elbow epitomises the harsh beauty of hidden Wales. With its crumbling surface and neglected rusting barriers it weaves through beautifully rugged scenery presenting one of the toughest challenges …

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12.3 km

Sarn Helen Roman Road

Highlight (Segment) • Trail

While views are great, the route is not suitable for gravel bikes as there’s a mix of medium and large rocks, had to spend too much time walking this section

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28.7 km

Heol Cefn-y-Gaer Ancient Track

Highlight (Segment) • Trail

An ancient pre-Roman track running down towards Defynnog. It passes an Iron-Age fort, and handily, is an excellent little descent!

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32.0 km

End point

Parking

Way Types & Surfaces

Way Types

14.3 km

9.84 km

5.70 km

1.63 km

363 m

139 m

Surfaces

14.4 km

7.84 km

7.31 km

1.87 km

431 m

180 m

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (470 m)

Lowest point (200 m)

Weather

Wednesday 6 May

13°C

6°C

36 %

Additional weather tips

Max wind speed: 16.0 km/h

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This route was planned by komoot.

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Sarn Helen and Twyn y Gaer loop — The Brecon Beacons National Park

St Cynog's Church, Defynnog

Devil's Elbow Climb from Heol Senni

Sarn Helen Roman Road

Heol Cefn-y-Gaer Ancient Track

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