The best MTB trails around Glasfynydd Forest
3.8
(17)
109
riders
9
rides
Mountain biking around Glasfynydd Forest offers diverse terrain within the Bannau Brycheiniog National Park. The area features extensive coniferous plantations, open moorland, and the Usk Reservoir, providing varied landscapes for riders. Trails are situated at elevations of 300-400 meters, surrounded by the Black Mountain/Mynydd Myddfai, creating a sense of wildness. This mix of forest tracks, reservoir-side paths, and moorland trails caters to different skill levels.
Best mountain bike trails around Glasfynydd Forest
- The most popular mountain bike trail is Usk…
Last updated: July 7, 2026
4.7
(6)
24
riders
11.9km
00:59
160m
150m
Embark on an easy mountain biking adventure through the Usk Reservoir and Glasfynydd Forest loop. This route spans 7.4 miles (11.9 km) and involves a gentle climb of 517 feet…
5.0
(1)
7
riders
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
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5.0
(1)
4
riders
22.7km
02:14
490m
490m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
10
riders
52.5km
04:57
1,090m
1,090m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.
9
riders
87.4km
07:14
1,580m
1,580m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.
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Tips from the Community
Cwm R MTB trail is completely blocked at top end due to hundreds of wind fallen trees this winter. Please consider before as you can not navigate loop.
1
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Good selection of cakes, coffee & snacks. Great stop off after a bike ride or hike.
1
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Moderate trail for all to explore and enjoy the beautiful sceneries
2
1
Moderate trail for most to enjoy, light elevation and amazing views on a clear day
1
1
Moderate trail with slight elevation and amazing views 👌🏼
1
1
THE TALE OF THE WELSH “ROBIN HOOD” Known as Twm Siôn Cati Twm Siôn Cati is a historically known figure in Welsh folklore. A tale recounted by Meyrick recalls how Twm was asked by a poor man to steal a pitcher for him. They went together to a merchant where Twm started belittling the man's wares. Having told his friend secretly to take the pitcher of his choice, Twm distracted the merchant by telling him there was a hole in one of the pitchers, which the man denied. Twm desired him to put his hand in the pitcher to test it and the man still denied there was a hole. Twm then asked him how, if there was no hole, could he have put his hand inside? By this time his friend had disappeared with his pitcher, undetected. A tale from Prichard's book involves an occasion when Twm is staying in an inn overnight and realises other people are planning to rob him the following day after he sets off. He has a large sum of money with him. The following morning he behaves as though his money is in the pack-saddle of his horse. When the highwayman catches up, Twm drops the saddle in the middle of a pool. The highwayman wades into the pool to fetch it, Twm takes the opportunity to make off with the highwayman's horse. A complication arises because the horse responds to the voice of the highwayman crying "Stop!" Luckily Twm, in terror, happens to shout a word which makes the horse gallop on again, and he is conveyed to safety. Another tale recounts how Twm waylaid a rich squire, who was accompanied by his daughter, Twm was so smitten with her that he returned her jewellery to her and attempted to woo her, against her father's opposition and, initially, her own. One full moon shortly after the robbery, he crept to her window, roused her from sleep, caught her hand at the window and kissed it, refusing to let her go until she promised to marry him. She wouldn't promise so Twm drew his dagger, drew blood on her wrist and threatened to sever her hand unless she assented to marriage forthwith. She agreed to marry him and she kept her hand. Their marriage followed soon after, despite her father's views and the directness of Twm's courtship methods. The girl was supposedly the widow of the sheriff of Carmarthen. Through this marriage Twm is supposed to have gained respectability, eventually becoming a justice of the peace, sitting in judgement on others, a position he held until his death aged 79.
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Frequently Asked Questions
How many mountain bike trails are available in Glasfynydd Forest?
There are 9 mountain bike trails around Glasfynydd Forest listed on komoot, offering a range of experiences from easy reservoir loops to challenging climbs through the forest and moorland.
What types of terrain can I expect on mountain bike trails in Glasfynydd Forest?
You'll encounter diverse terrain, including extensive coniferous plantations, open moorland, and paths skirting the Usk Reservoir. The trails are situated at elevations of 300-400 meters, providing varied landscapes and a sense of wildness within the Bannau Brycheiniog National Park.
Are there any easy mountain bike trails suitable for beginners or families in Glasfynydd Forest?
Yes, there are easy-grade trails. A popular option is the Usk Reservoir and Glasfynydd Forest loop, which is 7.4 miles (11.9 km) and follows a wide, stoned track around the reservoir. This route is generally suitable for those looking for a less strenuous ride.
What are some challenging mountain bike routes in Glasfynydd Forest?
For experienced riders seeking a challenge, routes like the Fan Gyhirych Forest Road – Usk Reservoir Track loop from Myddfai offer significant elevation gains and longer distances. This particular route is 76.5 km with over 1700 meters of climbing, demanding very good fitness and advanced skills.
Are there any circular mountain bike routes in Glasfynydd Forest?
Many of the trails in Glasfynydd Forest are circular. For example, the Mynydd Myddfai Trig Point – View of Usk Reservoir loop from Ynysfaen Camping is a moderate 11.1-mile (17.8 km) path that offers panoramic views and returns to its starting point.
What notable landmarks or viewpoints can I see while mountain biking in Glasfynydd Forest?
The Usk Reservoir is a central feature, offering scenic views across the water towards the Black Mountains. Trails like the Mynydd Myddfai Trig Point loop climb to a trig point, providing expansive vistas of the reservoir and surrounding moorland. The forest is also part of the Bannau Brycheiniog National Park, known for its breathtaking scenery.
What do other mountain bikers enjoy most about Glasfynydd Forest?
The trails in Glasfynydd Forest are highly rated by the komoot community, with an average score of 3.9 stars from over 12 reviews. Riders often praise the diverse landscapes, from tranquil reservoir-side paths to challenging forest climbs, and the sense of wildness within the National Park.
Is Glasfynydd Forest suitable for mountain biking with dogs?
Glasfynydd Forest is generally dog-friendly, but it's important to keep dogs under close control, especially due to the presence of wildlife and livestock in surrounding areas. Always follow local signage and national park guidelines regarding dogs.
Are there facilities like parking or picnic areas available at Glasfynydd Forest?
Yes, Glasfynydd Forest provides facilities including free parking and designated picnic areas, making it convenient for visitors to spend a day enjoying the trails and natural surroundings.
What is the best time of year to go mountain biking in Glasfynydd Forest?
Mountain biking in Glasfynydd Forest is enjoyable year-round, but conditions can vary. Spring and autumn offer pleasant temperatures and vibrant scenery. During winter, some trails may be muddy or icy, while summer provides longer daylight hours. Always check local weather conditions before heading out.
Are there any trails that pass through coniferous plantations?
Yes, the forest is characterized by extensive coniferous plantations. Routes such as the Singletrack Gravel Path – Chrychan Forest loop from Allt Craigyrwyddon will take you through these areas, offering a distinct forest riding experience.
Can I combine mountain biking with other activities in Glasfynydd Forest?
Absolutely. Being within the Bannau Brycheiniog National Park, you're immersed in a region offering a wide array of outdoor pursuits. Beyond cycling, you can enjoy walking, wildlife spotting, and stargazing, as Glasfynydd Forest is part of an International Dark Sky Reserve.
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