4.2
(23)
140
riders
29
rides
Mountain biking around Onllwyn offers a diverse landscape characterized by rolling hills, forested valleys, and remnants of industrial heritage. The region features a mix of natural trails, forest roads, and canal towpaths, providing varied riding experiences. Riders can expect routes that traverse through woodlands and open countryside, often following natural watercourses. The terrain provides a range of gradients suitable for different skill levels.
Last updated: June 21, 2026
4.5
(2)
10
riders
37.4km
03:20
790m
790m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(1)
11
riders
72.8km
03:56
330m
330m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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5
riders
52.3km
04:13
840m
840m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(1)
4
riders
25.6km
02:10
400m
400m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
6
riders
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.
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Peaceful route. Opportunities to stop at Afan Argoed country park and the old Station at Cymmer.
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You can enjoy lovely views of the town and Afon Valley from this high up viewpoint on Pontrhydyfen Viaduct. The viaduct itself was build in 1898 by the Port Talbot Railway.
1
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A beautiful & easy cycle trail suitable for most bikes
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Beautiful missy and green section of trail which crosses a stream that goes down the hillside. Lovely to take a moment on the ride and appreciate nature. Note: bridge does have grip tape on but still May be slightly slippery in the wet or winter conditions.
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Busy car park and £6 a day parking.
1
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One of the best trails to explore, everything from waterfalls to amazing sceneries. Good footwear is a must .
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1
There are over 30 mountain bike trails around Onllwyn, offering a diverse range of experiences. These include 5 easy routes, 22 moderate routes, and 3 difficult routes, catering to various skill levels.
The mountain bike trails around Onllwyn range from easy to difficult. The majority are classified as moderate, providing a good balance for most riders. For example, the Porth Yr Ogof Cave – Nant Hir Marker Stone loop from Ystradfellte is a popular moderate route.
Yes, Onllwyn offers 5 easy mountain bike routes suitable for beginners or those looking for a more relaxed ride. These trails often follow gentler gradients through forested valleys and along canal paths.
For experienced riders seeking a challenge, Onllwyn features 3 difficult mountain bike routes. These trails typically involve more significant elevation changes and technical sections, traversing varied terrain.
Spring and autumn generally offer the most pleasant conditions for mountain biking in Onllwyn, with milder temperatures and vibrant scenery. Summer can be excellent, but trails might be busier. Winter riding is possible, but conditions can be wet and muddy, requiring appropriate gear.
Yes, many of the mountain bike routes around Onllwyn are circular, allowing you to start and finish at the same point. Examples include the Porth Yr Ogof Cave – Fan Gyhirych Forest Road loop from Ystradfellte and the Porth Yr Ogof Cave loop from Ystradfellte.
The trails often pass through forested valleys, open countryside, and along natural watercourses. You can encounter natural monuments like the Fan Gyhirych Summit Trig Point, and several waterfalls such as Sgwd Yr Eira and Sgwd Gwladus Waterfall. Some routes also offer views of lakes and reservoirs like Craig-y-Nos Country Park and Castle.
Yes, several trails offer excellent viewpoints. The Fan Gyhirych Summit Trig Point provides panoramic views, and you can also find scenic spots like Sgwd Uchaf Clun-Gwyn Waterfall and views of Llyn Fawr from the Skyline Trail.
The area is highly rated by the komoot community, with an average score of 4.2 stars from over 21 reviews. Reviewers often praise the diverse landscape, which includes rolling hills, forested valleys, and canal towpaths, offering varied riding experiences for all skill levels.
Yes, for those looking for longer rides, routes like the Swansea Canal Towpath – Swansea Bay loop from Ystradgynlais cover a significant distance of 44.9 miles (72.2 km), leading through canal towpaths and coastal areas.
The trails around Onllwyn feature a mix of natural singletrack, forest roads, and canal towpaths. Conditions can vary with weather; natural trails may be muddy after rain, while forest roads and towpaths generally offer more consistent surfaces.
Specific parking information varies by trailhead. Many routes start from villages or popular natural attractions where designated parking areas are available. It's advisable to check the individual route details on komoot for the most accurate parking suggestions for your chosen trail.


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