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Mountain biking trails

Pontsarn Viaduct – Pontsticill Reservoir loop from Pentre-bach

Mountain biking trails

Pontsarn Viaduct – Pontsticill Reservoir loop from Pentre-bach

Easy

4.7

(6)

22

riders

Pontsarn Viaduct – Pontsticill Reservoir loop from Pentre-bach

01:36

26.9km

280m

Mountain biking

Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: August 8, 2026

Tips

Includes a segment in which cycling is not permitted

After 7.69 km for 120 m

Waypoints

A

Start point

Train Station

1

2.21 km

The Three Bridges, Merthyr Tydfil

Highlight • Cycleway

This is a nice stone bridge along the cyclepath just outside Merthyr Tydfil which makes a pretty spot to stop and take a picture.

Tip by

2

6.23 km

Merthyr Viaduct

Highlight (Segment) • Bridge

The Cefn-coed Viaduct is the third-largest viaduct in Wales. This huge, curved structure once carried the Brecon and Merthyr Tydfil Junction Railway and is now part of the Taff Trail, …

Tip by

3

6.43 km

Cefn-coed Viaduct

Highlight • Monument

The Cefn-coed Viaduct is the third-largest viaduct in Wales. This huge, curved structure once carried the Brecon and Merthyr Tydfil Junction Railway and is now part of the Taff Trail, …

Tip by

4

9.47 km

Pontsarn Viaduct

Highlight • Historical Site

Good ride

Tip by

5

10.9 km

Morlais Tunnel South Portal

Highlight • Structure

Easy to miss in the summer when trees in full growth. If you are cycling past the tunnel on the taff trail in the summer heat you'll get a lovely blast of cool air for about 100 yards.

Tip by

6

10.9 km

Taf Trail

Highlight • Cycleway

The full route provides a fantastic mix of terrain and scenery😊

Tip by

7

13.2 km

Pontsticill Reservoir

Highlight • Structure

Pontsticill Reservoir is a great location for its scenic beauty and because it is the start of many hiking and biking trails. There is a nice trail that actually goes …

Tip by

8

14.8 km

Taf Fechan River Bridge

Highlight • River

To access this area is a very steep incline and decline into this valley section 7- 9% gradient in either direction.

Tip by

B

26.9 km

End point

Train Station

Way Types & Surfaces

Way Types

20.3 km

4.57 km

1.27 km

474 m

243 m

< 100 m

Surfaces

23.5 km

2.80 km

381 m

121 m

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Elevation

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

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Weather

Powered by Foreca

Monday 5 October

18°C

12°C

32 %

Additional weather tips

Max wind speed: 8.0 km/h

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