4.4
(30)
354
riders
11
rides
Mountain biking around Llanfair-Ar-Y-Bryn offers routes through the scenic Doethie Valley and around Llyn Brianne. The region is characterized by varied terrain, including forest trails, open mountain landscapes, and lakeside paths. Riders can expect a mix of ascents and descents, providing diverse challenges for mountain bikers. The area's natural features, such as the Cambrian Mountains, contribute to a dynamic riding experience.
Last updated: May 4, 2026
5.0
(1)
11
riders
33.9km
03:09
770m
770m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
3.0
(1)
5
riders
49.5km
04:41
1,200m
1,200m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.

Sign up for free
5.0
(1)
3
riders
22.9km
02:20
520m
520m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
2.0
(2)
37
riders
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(1)
4
riders
22.7km
02:14
490m
490m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
Get access to more routes and recommendations from other explorers.
Sign up for free
Already have an account?
Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.
Start today with a free account
Your next adventure awaits.
Login or Signup
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.
1
0
Lovely mix of fire road to start with and then a huge climb up and over into a valley that time forgot - perfect single track - although can be a bit muddy in places. Probably best to make sure there has not been too much rain in the week before riding this route - and in the winter be prepared for quick changes of weather and plummeting temperatures.
1
0
This attractive RSPB site has a circular footpath adjacent to a river with beautiful rock cascades and old mossy trees. It is also home to the Twm Sion Cati's cave. All worth a look off of the bike.
1
0
Capel Soar Y Mynydd is the most remote chapel in Wales. An invaluable spot to find some shelter on longer trips!
2
0
Llyn Brianne is a spectacular reservoir at almost 300m (990ft) above sea level. It is Wales second largest reservoir by volume and is contained by a 91m (300ft) stone-built dam, which is the largest of its kind in Europe.
1
0
There are 11 mountain bike trails around Llanfair-Ar-Y-Bryn, offering a range of experiences through varied terrain. These include 7 moderate routes and 4 difficult routes, ensuring options for different skill levels.
While there are no trails specifically graded as 'easy' in this selection, there are 7 moderate routes that could be suitable for beginners looking for a challenge, or those with some prior mountain biking experience. For example, the Doethie Valley and Llyn Brianne loop is a moderate 33.9 km trail with scenic views.
For experienced riders seeking a challenge, the Llyn Brianne and the Cambrian Mountains loop is a difficult 49.5 km route featuring expansive views and demanding ascents. There are 4 difficult trails in total, offering significant elevation gains and technical sections.
Yes, all the mountain bike routes listed for Llanfair-Ar-Y-Bryn are circular loops. This includes popular options like the Brynffo and Esgair Fwyog loop, which is a 23.0 km trail through forest and moorland.
The terrain around Llanfair-Ar-Y-Bryn is diverse, featuring a mix of forest trails, open mountain landscapes, and lakeside paths, particularly around Llyn Brianne. Riders will encounter varied challenges with both ascents and descents across the rolling terrain of the Cambrian Mountains.
The mountain bike trails in Llanfair-Ar-Y-Bryn are highly rated by the komoot community, with an average score of 4.4 stars from around 30 reviews. Riders often praise the varied terrain, the stunning scenery of the Doethie Valley and Llyn Brianne, and the challenging nature of the routes.
While riding, you can explore several points of interest. The Twm Siôn Cati's Cave is a notable historical site, and the Wolf's Leap on the River Irfon offers a dramatic gorge view. Many routes also pass by the scenic Llyn Brianne Gravel Road.
Yes, the area is rich in both. You can visit the Llandovery Castle Ruins for a glimpse into history. For natural monuments, consider exploring the Mynydd Myddfai Trig Point or the Pen y Garn-goch Summit for panoramic views.
The mountain bike trails in Llanfair-Ar-Y-Bryn vary in length. For example, the Singletrack Gravel Path – Chrychan Forest loop is about 22.6 km, while the Twm Siôn Cati's Cave – Llyn Brianne Dam Crossing loop is around 28.5 km. The longest route is nearly 50 km, offering options for various endurance levels.
While mountain biking is possible year-round, the spring and autumn months generally offer the most pleasant conditions with milder temperatures and vibrant scenery. Summer can be excellent, but be prepared for potentially warmer weather. Winter riding is possible but may involve colder temperatures and wetter, muddier trails.
Absolutely. The Llyn Brianne and the Cambrian Mountains loop is specifically designed to showcase expansive views across the Cambrian Mountains, providing a truly immersive experience in the region's natural beauty.


Browse the best MTB trails in other regions.