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United Kingdom
Wales
South Wales

Onllwyn

The best MTB trails around Onllwyn

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.

Best mountain bike trails around Onllwyn

  • The most popular mountain bike trail is Porth Yr Ogof Cave…

Last updated: June 21, 2026

4.5

(2)

10

riders

#1.

Porth Yr Ogof Cave – Fan Gyhirych Forest Road loop from Ystradfellte

37.4km

03:20

790m

790m

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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Moderate

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

Moderate
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Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

Moderate

5.0

(1)

4

riders

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

Moderate

Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.

Hard
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Popular around Onllwyn

Road Cycling Routes around Onllwyn

Cycling around Onllwyn

Running Trails around Onllwyn

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Gravel biking around Onllwyn

Tips from the Community

Mark Jacobs
April 7, 2026, Afan Valley Cycle Route

Peaceful route. Opportunities to stop at Afan Argoed country park and the old Station at Cymmer.

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“Base” Good coffee/food stop.

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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.

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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 .

0

1

Frequently Asked Questions

How many mountain bike trails are there around Onllwyn?

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.

What are the typical difficulty levels of mountain bike trails in Onllwyn?

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.

Are there beginner-friendly mountain bike trails in Onllwyn?

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.

Are there challenging mountain bike routes for experienced riders in Onllwyn?

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.

What is the best time of year for mountain biking in Onllwyn?

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.

Are there circular mountain bike routes available in Onllwyn?

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.

What can I see along the mountain bike trails around Onllwyn?

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.

Are there good viewpoints along the mountain bike trails in Onllwyn?

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.

What do other mountain bikers enjoy the most about mountain biking in Onllwyn?

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.

Are there any long-distance mountain bike routes in the Onllwyn area?

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.

What are the typical trail conditions for mountain biking in Onllwyn?

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.

Where can I find parking for mountain biking in Onllwyn?

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.

Most popular routes around Onllwyn

Road Cycling Routes around Onllwyn

Most popular attractions around Onllwyn

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