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Mountain biking trails

Pontsarn Viaduct – Pontsticill Reservoir loop from Pentre-bach

Routes

Mountain biking trails

Pontsarn Viaduct – Pontsticill Reservoir loop from Pentre-bach

Easy

4.7

(6)

riders

Pontsarn Viaduct – Pontsticill Reservoir loop from Pentre-bach

01:35

26.5km

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: March 18, 2026

Tips

Includes a segment in which cycling is not permitted

After 7.56 km for 120 m

Waypoints

Start point

Train Station

Get Directions

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

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

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

6.80 km

Narrow Section and Bridge over Valleys Road

Highlight • Other

narrow section only 1 bike or person can get though. The bridge has been redesigned and the biking gates removed

Tip by

9.34 km

Pontsarn Viaduct

Highlight • Historical Site

Good ride

Tip by

10.8 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

10.8 km

Taf Trail

Highlight • Cycleway

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

Tip by

13.1 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

26.5 km

End point

Train Station

Way Types & Surfaces

Way Types

20.6 km

3.94 km

1.27 km

571 m

123 m

< 100 m

Surfaces

23.2 km

2.61 km

472 m

121 m

Elevation

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

Weather

Tuesday 16 June

18°C

12°C

87 %

Additional weather tips

Max wind speed: 23.0 km/h

to get more detailed weather forecasts along your route

Comments

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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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Pontsarn Viaduct – Pontsticill Reservoir loop from Pentre-bach

The Three Bridges, Merthyr Tydfil

Merthyr Viaduct

Cefn-coed Viaduct

Narrow Section and Bridge over Valleys Road

Pontsarn Viaduct

Morlais Tunnel South Portal

Taf Trail

Pontsticill Reservoir

Nearby routes

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