4.3
(37)
404
riders
23
rides
Mountain biking around Tywi Forest offers a diverse landscape for off-road exploration. The region is characterized by dense woodlands, river valleys like the Doethie Valley, and large reservoirs such as Llyn Brianne, Claerwen Reservoir, and Craig Goch Reservoir. These features provide varied terrain, including challenging climbs and scenic descents, suitable for experienced mountain bikers.
Last updated: July 4, 2026
5.0
(1)
3
riders
63.2km
05:53
1,300m
1,300m
This difficult 39.3-mile mountain biking loop in the Claerwen National Nature Reserve offers remote Welsh landscapes and reservoir views.
2
riders
48.9km
04:34
900m
900m
This difficult 30.4-mile mountain biking loop around Claerwen Reservoir offers remote beauty, challenging terrain, and stunning views in the

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5.0
(1)
12
riders
33.9km
03:09
770m
770m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
2.0
(2)
36
riders
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
1
riders
57.9km
05:23
1,250m
1,250m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.
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Really amazing flat out and techy gravel riding
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Went rear brake only down the steepest part (slate section near the end) just to stop the fear of front end washing out.
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A great ride up through the woods, especially useful in the summer when the road alternative can be busy.
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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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Rough and ready along the side here
1
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Did this in heavy rain and stayed in the bothy. Really amazing trail and I think it links to Dolgoch too?
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Tywi Forest primarily offers moderate to difficult mountain bike trails. There are currently no routes classified as easy in our guide. Riders should be prepared for challenging terrain, significant elevation changes, and remote sections. For example, the Doethie Valley and Llyn Brianne loop is a moderate route, but still covers 21.0 miles with over 770 meters of ascent.
The mountain bike trails in Tywi Forest vary significantly in length and elevation. You can expect routes ranging from around 20 miles (32 km) to over 39 miles (63 km). Elevation gains are substantial, often between 700 meters and 1300 meters, reflecting the challenging nature of the terrain. For instance, the Trans Cambrian Way and Claerwen Reservoir Loop is 39.3 miles long with over 1300 meters of climbing.
Parking options in Tywi Forest are generally limited to small, informal car parks or lay-bys near trailheads and key access points. Popular starting points for routes often have designated parking areas, such as near Llyn Brianne or along the Claerwen Reservoir. It's advisable to check the specific route details on komoot for recommended starting points and parking information before your ride.
The best time to mountain bike in Tywi Forest is typically from late spring through early autumn (May to October). During these months, the weather is generally milder, and trail conditions are drier, making for a more enjoyable and safer ride. Winter months can bring challenging conditions, including mud, ice, and shorter daylight hours, requiring appropriate gear and caution.
Tywi Forest's mountain bike trails are characterized by a mix of forest tracks, gravel roads, and natural singletrack. Due to the region's climate, trails can often be muddy and wet, especially after rain or during winter. Expect some rocky sections and potentially loose surfaces, particularly on descents. The remote nature of many routes means trails are less manicured than purpose-built trail centers.
Yes, the Tywi Forest area, with its large reservoirs like Llyn Brianne, Claerwen Reservoir, and Craig Goch Reservoir, offers potential spots for wild swimming. While not officially designated swimming areas, many riders enjoy a refreshing dip in suitable, safe locations. Always exercise caution, be aware of water safety, and respect local regulations regarding swimming in reservoirs.
Yes, many of the mountain bike routes in Tywi Forest are designed as circular loops, allowing you to start and finish at the same point. Examples include the Trans Cambrian Way: Claerwen Reservoir Loop and the Twm Siôn Cati's Cave – Llyn Brianne Dam Crossing loop from RSPB Gwenffrwd-Dinas. These loops are ideal for day trips, as they bring you back to your starting location.
Beyond the stunning natural landscapes of dense woodlands and river valleys, you can encounter several interesting points along the trails. Highlights include the challenging Devil's Staircase Climb (Abergwesyn), the historic View of Strata Florida, and the remote Moel Prysgau Bothy. These attractions offer a glimpse into the region's rugged beauty and history.
The area is highly rated by the komoot community, with an average score of 4.4 stars from over 40 reviews. Reviewers often praise the remote, wild feel of the trails, the expansive views over the reservoirs, and the challenging nature of the rides. The sense of adventure and solitude in the dense woodlands and river valleys is frequently highlighted as a major draw.
Given the remote and challenging nature of many trails, safety is paramount. Always carry appropriate gear, including navigation tools, a first-aid kit, and sufficient food and water. Mobile phone signal can be intermittent in certain areas. It's advisable to inform someone of your route and expected return time, and be prepared for rapidly changing weather conditions in this upland environment.
Yes, Tywi Forest is well-suited for experienced mountain bikers, with 11 routes classified as difficult. These trails feature significant climbs, technical descents, and long distances through remote upland areas. An example is the View of Craig Goch Reservoir – Claerddu River Crossing loop from Pontrhydfendigaid, which is nearly 36 miles long with over 1200 meters of elevation gain.


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