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Routes
Mountain biking trails
United Kingdom
Wales
South Wales
Talgarth

Black Mountains and Grwyne Fawr Loop

Hard

4.4

(22)

179

riders

Black Mountains and Grwyne Fawr Loop

04:22

42.5km

1,270m

Mountain biking

Prepare for a difficult mountain biking adventure on the Black Mountains and Grwyne Fawr Loop, a challenging 26.4 miles (42.5 km) route. You will climb 4151 feet (1265 metres) over an estimated 4 hours and 21 minutes, traversing remote landscapes with panoramic vistas. The trail offers whip-fast, swoopy descents over…

Last updated: April 23, 2026

Tips

Includes very steep uphill segments

You may need to push your bike.

After 5.38 km for 1.30 km

After 22.0 km for 227 m

Waypoints

A

Start point

Parking

Get Directions

1

9.64 km

Grwyne Fawr Bothy

Highlight • Mountain Hut

Grwyne Fawr bothy is a wonderful place to spend the night. On the banks of the reservoir, and nestled between the hills that give it its name, it's a perfectly …

Tip by

2

23.8 km

The Beacons Way from Crug Mawr

Highlight (Segment) • Trail

A gloriously fast descent with a (relatively) well draining surface - at least compared to some of the other summits hereabouts - means that this is tip top fun to ride down. Riding up, not so much.

Tip by

3

27.3 km

Red Lion Pub

Highlight • Restaurant

A friendly local that serves snacks and drinks. Meals are available but it's best to pre book if you want more than a sandwich. A few outdoor seats, good stop off point on a bike ride.

Tip by

4

39.0 km

Rhiw Trumau Path

Highlight (Segment) • Trail

There are plenty of ways down from the saddle of the hill from here, but this one is particularly fun. Narrow singletrack on the top becomes wider and rockier before …

Tip by

B

42.5 km

End point

Parking

Loading

Way Types & Surfaces

Way Types

18.5 km

12.2 km

9.67 km

2.07 km

< 100 m

< 100 m

Surfaces

21.8 km

9.52 km

4.95 km

3.90 km

1.61 km

718 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (690 m)

Lowest point (150 m)

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Weather

Powered by Foreca

Wednesday 6 May

13°C

4°C

46 %

Additional weather tips

Max wind speed: 16.0 km/h

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This route was planned by komoot.

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Frequently Asked Questions

What is the terrain like on the Black Mountains and Grwyne Fawr Loop?

The terrain is diverse and demanding, typical of a hard-graded mountain bike route. You'll encounter remote valleys, numerous river crossings, and challenging, long climbs. Expect sections requiring you to push and carry your bike, especially up to Y Das. The route also features fast, swooping descents over moorland tracks, transitioning into woodsy switchbacks, rocky chutes, and bumpy doubletrack. Some parts are rough and stony, others gravel fire roads, and narrow singletrack. Be prepared for potentially wet and boggy sections, particularly after rain.

Is this trail suitable for beginners or families?

No, this trail is considered a difficult or black-graded route, requiring very good fitness and advanced mountain biking skills. It is not suitable for beginners or families looking for an easy ride due to its challenging terrain, significant climbs, and remote nature.

What are the main points of interest along the route?

The loop offers magnificent views throughout, especially of the Black Mountains, the Grwyne Fawr Reservoir, and the Wye Valley. Notable spots include the remote Grwyne Fawr Bothy, sections of The Beacons Way from Crug Mawr, and the scenic Rhiw Trumau Path. You might also pass by the Red Lion Pub, a good spot for a break.

What is the best time of year to ride this loop?

The best time to ride is typically during drier months, from late spring to early autumn (May to October). This avoids the worst of the wet and boggy conditions that can make parts of the trail very challenging. Always check the weather forecast before you go, as conditions in the Black Mountains can change rapidly.

Does the trail intersect with other well-known paths?

Yes, the route intersects with several other paths. You'll find yourself on sections of the Beacons Way, the Cambrian Way, and the South Wales Traverse at various points along the loop.

Are dogs allowed on the Black Mountains and Grwyne Fawr Loop?

Yes, dogs are generally allowed on this trail. However, as it's a remote area with livestock, it's crucial to keep your dog under close control, preferably on a leash, especially near sheep and other animals. Always follow the Countryside Code.

Do I need a permit or is there an entrance fee for this trail in Bannau Brycheiniog National Park?

There is no specific permit or entrance fee required to access the Black Mountains and Grwyne Fawr Loop or Bannau Brycheiniog National Park itself. However, you should always respect the park's regulations, such as keeping dogs on leads near livestock and leaving no trace.

Where can I park to access the Black Mountains and Grwyne Fawr Loop?

While the Komoot tour starts from Pengenffordd, there are various access points around the Black Mountains. For this specific loop, parking options can be found in villages like Llanbedr or near the Grwyne Fawr valley. Always check local signage for designated parking areas and any potential fees.

Are there any pubs or cafes along the route for refreshments?

The route is quite remote, so opportunities for refreshments are limited. The Red Lion Pub is a highlight mentioned, which could be a good stop depending on your chosen starting point and direction. It's essential to carry enough food and water for the entire ride, as services are scarce.

What should I bring for a mountain bike ride on this trail?

Given the trail's difficulty and remoteness, you should be well-prepared. Bring plenty of water and snacks, a first-aid kit, navigation tools (GPS device or map and compass), and essential bike repair tools and spares (e.g., spare tubes, pump). Waterproof and warm layers are crucial, as the weather can change quickly in the Black Mountains.

Is there an insider tip for tackling this challenging loop?

Absolutely. This is a committing route, so planning is key. Many riders find that tackling the steepest climbs, like the push up to Y Das, early in the ride while you're fresh can make the overall experience more enjoyable. Also, be aware that the trail can be very wet and boggy after rain, so consider postponing your ride if conditions are poor, or be prepared for a much tougher slog.

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The Gap — The Brecon Beacons National Park

03:15h

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Trail Reviews

Smelly
August 13, 2022, Black Mountains Classic

This tour is not ideal in 33 degree heat of August 2022. There are several sections which are overgrown and almost unrideable. There is 2 or 3 severe climbs that require you to push and carry your bike. Requires very expert riding and physical fitness. Even on an ebike did 700w battery to empty on trail mode

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