View of Bryn Oer Tramroad – Cwm Callan Roman Road Trail loop from Nant-y-Bwch

Mountain biking trails

View of Bryn Oer Tramroad – Cwm Callan Roman Road Trail loop from Nant-y-Bwch

Hard

4.0

(2)

riders

View of Bryn Oer Tramroad – Cwm Callan Roman Road Trail loop from Nant-y-Bwch

03:29

40.3km

590m

Mountain biking

Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike. The starting point of the route is accessible with public transport.

Last updated: August 27, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Bannau Brycheiniog National Park

Waypoints

Start point

Bus stop

Get Directions

9.13 km

View of Bryn Oer Tramroad

Highlight • Viewpoint

If climbing this is the end of the steep section, if descending this is the start of a blue/red rocky descent. Insane views from high up

MTB or brave graveller only

Tip by

9.17 km

Cwm Callan Roman Road Trail

Highlight (Segment) • Viewpoint

An old Roman Road which lends itself magnificently to fun on two wheels. Wide open, with fabulous views, before darting into woodland as it reaches the reservoir.

Tip by

13.7 km

Ponsticill Reservoir

Highlight • Viewpoint

17.8 km

The Gap Trail Fork

Highlight • Viewpoint

Take the left fork to avoid the massive gully and replace it with an easy ramp. It also doesn't get as techy as that initial section until later on

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18.9 km

Start of The Gap Trail, Bannau Brycheiniog National Park

Highlight • Trail

Steady rocky climb

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21.5 km

The Gap (Bannau Brycheiniog National Park)

Highlight • Mountain Pass

Lying in the saddle between Pen y Fan and Fan y Big, the Gap has long been a focal point for mountain biking in the Brecons.

Best ridden from south …

Tip by

40.3 km

End point

Bus stop

Way Types & Surfaces

Way Types

24.4 km

10.4 km

5.12 km

347 m

Surfaces

17.2 km