Allt Rhyd Y Groes National Nature Reserve
Allt Rhyd Y Groes National Nature Reserve
4.8
(5)
150
riders
7
rides
No traffic road cycling routes around Allt Rhyd Y Groes National Nature Reserve traverse a landscape characterized by sessile oak woodlands, steep gorges, and rivers such as the Towy and Afon Pysgotwr Fawr. The area features undulating terrain with varied gradients, offering a mix of challenging climbs and scenic descents. Cyclists will encounter open meadows and craggy heathland, providing diverse backdrops for rides. This region of Carmarthenshire is known for its quiet country lanes, making it suitable for road cycling…
Last updated: July 9, 2026
31
riders
27.7km
01:28
230m
230m
Easy road ride. Great for any fitness level. Mostly well-paved surfaces and easy to ride.
24
riders
57.1km
03:40
1,110m
1,110m
Hard road ride. Very good fitness required. Some segments of this route may be unpaved and difficult to ride.

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5.0
(1)
6
riders
15.8km
01:07
270m
270m
Moderate road ride. Great for any fitness level. Some segments of this route may be unpaved and difficult to ride.
5
riders
53.1km
03:27
1,100m
1,100m
Hard road ride. Very good fitness required. Some segments of this route may be unpaved and difficult to ride.
5.0
(1)
13
riders
50.7km
02:57
690m
690m
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.
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Popular around Allt Rhyd Y Groes National Nature Reserve
A colour village. Llandovery is a lovely place to visit.
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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.
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Confronting the Devil's Staircase northbound from near Llyn Brianne reservoir is tackling one of Wales's most infamous climbs, famed for its savage steepness and remote beauty. Prepare for an immediate, brutal ascent as the narrow single-track road rears up, averaging a punishing 10-13% but hitting steep ramps well over 20%, reportedly reaching 25-30%. Feel the wild exposure of the Cambrian Mountains, with stunningly remote views as your reward for conquering this truly devilish challenge.
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It was a truly stunning spot to take in the scenery from this elevated panoramic viewpoint. Highly recommended.
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It's a truly stunning ride valley mountain road and not to be missed if you are in the area.
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A short climb up from the road brings you to the Dam and carpark, there is no access over the Dam itself. But you do get a good view over the spillway and valley below.
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There are 7 dedicated no traffic road cycling routes available around Allt Rhyd Y Groes National Nature Reserve, offering a variety of distances and difficulty levels for a peaceful ride.
The routes cater to various skill levels. You'll find 1 easy route, 3 moderate routes, and 3 difficult routes. For an easy option, consider The Towy Bridge Inn – Rhandirmwyn Bridge loop from Rhandirmwyn, which is just under 28 km.
While specific 'family-friendly' designations aren't always clear for road cycling, the easy route, The Towy Bridge Inn – Rhandirmwyn Bridge loop from Rhandirmwyn, offers a gentler experience at under 28 km with moderate elevation gain, making it potentially suitable for families with older children or those looking for a less strenuous ride.
The routes traverse the beautiful Carmarthenshire countryside, characterized by sessile oak woodlands, steep gorges, and views of rivers like the Towy and Afon Pysgotwr Fawr. You might also encounter open meadows and craggy heathland. The area is known for its vibrant spring flora, including bluebells, and diverse wildlife.
Yes, all the routes listed are circular, allowing you to start and finish at the same point. For example, the Llyn Brianne Dam – View of Llyn Brianne loop from Pwll Yr Hyddod offers a challenging 57 km circular ride with significant elevation.
While specific parking areas for each route aren't detailed, the routes often start from villages like Rhandirmwyn or Cilycwm, or locations near Llyn Brianne Dam. These areas typically offer local parking options. It's advisable to check local information for parking availability at your chosen starting point.
Spring and summer are generally ideal for road cycling in this region, offering pleasant weather and the chance to see the woodlands in full bloom with bluebells and other wildflowers. Autumn also provides beautiful scenery with changing foliage. Winter cycling is possible but be prepared for colder, potentially wetter conditions and shorter daylight hours.
Absolutely. The area around Allt Rhyd Y Groes National Nature Reserve, being part of the wider Mid Wales region, offers varied gradients and significant climbs. Routes like the Llyn Brianne Dam – Abergwesyn Pass loop from Pwll Yr Hyddod (over 53 km with 1099m elevation gain) provide a demanding experience for advanced cyclists.
The routes often pass through or start near small villages such as Rhandirmwyn or Llandovery, which is a short distance away. These locations may offer pubs or cafes where you can refuel. It's a good idea to plan your stops in advance, especially on longer routes, as services can be sparse in rural areas.
The area is highly rated by the komoot community, with an average score of 4.75 stars from 4 ratings. Cyclists often praise the quiet country lanes, the stunning natural beauty of the Carmarthenshire landscape, and the rewarding views offered by the varied terrain.
The routes vary significantly in length. The shortest route, The Towy Bridge Inn – Llyn Brianne Dam loop from Rhandirmwyn, is approximately 15.8 km. The longest route, Llyn Brianne Dam – View of Llyn Brianne loop from Pwll Yr Hyddod, extends to about 57 km, offering options for both shorter excursions and longer, more demanding rides.


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